vaccines

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Record measles outbreak in Oregon blamed on vaccine exemptions

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consequences —

Vaccine exemptions at nearly 9% in the state, enabling sustained transmission.

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A US child infected with measles during a 2024 outbreak. The child’s cheek shows the characteristic rash associated with this viral infection.

Enlarge / A US child infected with measles during a 2024 outbreak. The child’s cheek shows the characteristic rash associated with this viral infection.

With one of the highest vaccine exemption rates in the country, Oregon is experiencing its largest measles outbreak in decades. This year’s count is now higher than anything seen since 2000, when the Centers for Disease Control and Prevention declared the highly contagious virus eliminated from the US.

Since the start of the year, Oregon has tallied 31 cases of measles, all in unvaccinated people. The cases have been accumulating in sustained waves of transmission since mid-June.

Last month, when the outbreak tally was still in the 20s, health officials noted that it was nearing a state record set in 2019. There were 28 cases that year, which were linked to a large outbreak across the border in Washington state. But, with that record now surpassed, the state is in pre-elimination territory.

“Before 2019, you have to go all the way back to the early 1990s to see case counts this high,” Paul Cieslak, medical director for communicable diseases and immunization at Oregon Health Authority, said in a statement. “The reason is, we maintained very high vaccination rates and very high population levels of immunity. Unfortunately, we’ve seen an erosion in the percentage of people who are getting vaccinated against measles.”

Vaccination decline

In 2000, when measles was declared officially eliminated, only about 1 percent of kindergarteners in the state had exemptions from childhood vaccines, such as measles. But in the years since, Oregon has become one of the states with the highest exemption rates in the country. In the 2022–2023 school year, 8.2 percent of Oregon kindergarteners had exemptions from vaccinations, according to a CDC analysis published in November. Only Idaho had a higher rate, with 12.1 percent of kindergarteners exempt. Utah was a close third, with 8.1 percent, followed by Arizona (7.4 percent) and Wisconsin (7.2 percent).

Oregon’s exemption rate has risen since then, with the exemption rate now at 8.8 percent, according to the Oregon Health Authority. Any exemption rate above 5 percent is concerning. At that threshold, even if every non-exempt child is vaccinated, a state will not be able to achieve the target of 95 percent vaccine coverage expected to prevent sustained transmission of infectious diseases.

Health officials are directly linking the rise of non-medical exemptions to the current measles outbreak, which is centered in Clackamas, Marion, and Multnomah counties. All three are in the northwestern corner of the state, with Clackamas and Multnomah in the Portland area.

“In Clackamas County, as in other Oregon counties, pockets of unvaccinated people raise risk of infection in communities where they live,” Clackamas County Health Officer Sarah Present said. “That’s why the counties reach out to every case that’s been identified and try to determine exactly where they’ve been while infectious.”

Notorious virus

Measles is among the most infectious viruses known. It is notorious for its ability to stay aloft in indoor air for up to two hours after an infected person has been present. For unvaccinated people who are exposed, up to 9 out of 10 will end up falling ill. Those who become infected are contagious from about four days before developing the tell-tale rash and four days after it erupts. Other common symptoms of the infection include high fever, runny nose, cough, and conjunctivitis (pink eye). Many children become severely ill, requiring hospitalization.

In a small percentage of cases, measles can lead to severe complications, including pneumonia, encephalitis, and a progressive neurological disorder (subacute sclerosing panencephalitis), which develops five to 10 years after an initial infection. Additionally, measles is known to cause “immune amnesia.” That is, being infected with measles virus wipes out existing antibodies and immune responses to other germs, leaving people more vulnerable to other diseases.

Two doses of MMR vaccine (measles, mumps, and rubella) are 97 percent effective against measles, and that protection is considered life-long.

So far this year, the US has logged 236 measles cases. Of those, 40 percent were in children under the age of 5, while 30 percent were in children and teens between the ages 5 and 19. Eighty-seven percent were either unvaccinated or had an unknown vaccination status. Forty-four percent (103 of 236) were hospitalized.

While Oregon’s current outbreak has broken its state records, the largest outbreak this year was in Illinois, where a total of 67 cases were reported amid spread at a Chicago-area migrant shelter.

This year’s tally is already well ahead of the total for 2023, which reached just 59 cases. It is still significantly lower than the 1,274 cases seen in 2019, when the US nearly lost its elimination status.

Record measles outbreak in Oregon blamed on vaccine exemptions Read More »

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COVID shot now or later? Just getting it at all is great, officials respond.

CDC, COVID-19, fda, flu, health, HHS, Infectious disease, respiratory virus, RSV, Science, vaccines / /

Viral defences —

As the summer wave peaks, officials are prepping for the coming winter wave.

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A 13-year-old celebrates getting the Pfizer-BioNTech COVID-19 vaccine in Hartford, Connecticut, on May 13, 2021.

Enlarge / A 13-year-old celebrates getting the Pfizer-BioNTech COVID-19 vaccine in Hartford, Connecticut, on May 13, 2021.

With the impending arrival of the 2024–2025 COVID-19 vaccines approved yesterday, some Americans are now gaming out when to get their dose—right away while the summer wave is peaking, a bit later in the fall to maximize protection for the coming winter wave, or maybe a few weeks before a big family event at the end of the year? Of course, the group pondering such a question is just a small portion of the US.

Only 22.5 percent of adults and 14 percent of children in the country are estimated to have gotten the 2023–2024 vaccine. In contrast, 48.5 percent of adults and 54 percent of children were estimated to have gotten a flu shot. The stark difference is despite the fact that COVID-19 is deadlier than the flu, and the SARS-CoV-2 virus is evolving faster than seasonal influenza viruses.

In a press briefing Friday, federal health officials were quick to redirect focus when reporters raised questions about the timing of COVID-19 vaccination in the coming months and the possibility of updating the vaccines twice a year, instead of just once, to keep up with an evolving virus that has been producing both summer and winter waves.

“The current problem is not that the virus is evolving so much, at least in terms of my estimation,” Peter Marks, the top vaccine regulator at the Food and Drug Administration, told journalists. “It’s that we don’t have the benefits of the vaccine, which is [to say] that it’s not vaccines that prevent disease, it’s vaccination. It’s getting vaccines in arms.” When exactly to get the vaccine is a matter of personal choice, Marks went on, but the most important choice is to get vaccinated.

Estimates for this winter

The press briefing, which featured several federal health officials, was intended to highlight the government’s preparations and hopes for the upcoming respiratory virus season. The FDA, the Centers for Disease Control and Prevention, and the Department of Health and Human Services (HHS) are urging all Americans to get their respiratory virus vaccines—flu, COVID-19, and RSV.

CDC Director Mandy Cohen introduced an updated data site that provides snapshots of local respiratory virus activity, national trends, data visualizations, and the latest guidance in one place. HHS, meanwhile, highlighted a new outreach campaign titled “Risk Less. Do More.” to raise awareness of COVID-19 and encourage vaccination, particularly among high-risk populations. For those not at high risk, health officials still emphasize the importance of vaccination to lower transmission and prevent serious outcomes, including long COVID. “There is no group without risk,” Cohen said, noting that the group with the highest rates of emergency department visits for COVID-19 were children under the age of 5, who are not typically considered high risk.

So far, CDC models are estimating that this year’s winter wave of COVID-19 will be similar, if not slightly weaker on some metrics, than last year’s winter wave, Cohen said. But she emphasized that many assumptions go into the modeling, including how the virus will evolve in the near future and the amount of vaccine uptake. The modeling assumes the current omicron variants stay on their evolutionary path and that US vaccination coverage is about the same as last year. Of course, beating last year’s vaccine coverage could blunt transmission.

COVID shot now or later? Just getting it at all is great, officials respond. Read More »

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FDA green-lights fall COVID-19 boosters

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Shoot me up —

Updated mRNA vaccines from Pfizer and Moderna are ready to roll.

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FDA green-lights fall COVID-19 boosters

Getty Images

As the COVID-19 case count continues to tick upward, the US Food and Drug Administration has approved an updated vaccine for use ahead of the northern hemisphere winter. The emergency use authorization covers updated mRNA vaccines from both Pfizer and Moderna.

The booster shots will target the JN.1 and KP.2 strains of SARS-CoV-2, both of which are omicron variants. Last year’s booster keyed on omicron subvariant XBB.1.5, which has long since lost the evolutionary arms race.

Both Spikevax (Moderna) and Comirnaty (Pfizer) vaccines have been updated. While the vaccine is targeted toward those 12 and over, parents of children aged six months through 11 years are also eligible for the updated vaccines under the FDA’s emergency use authorization.

“Vaccination continues to be the cornerstone of COVID-19 prevention,” said Peter Marks, director of the FDA’s Center for Biologics Evaluation and Research. “These updated vaccines meet the agency’s rigorous, scientific standards for safety, effectiveness, and manufacturing quality. Given waning immunity of the population from previous exposure to the virus and from prior vaccination, we strongly encourage those who are eligible to consider receiving an updated COVID-19 vaccine to provide better protection against currently circulating variants.”

Updated vaccines will hit hospitals and pharmacies soon, as Moderna and Pfizer are ready to ship vaccines. Once injected, the boosters will take a couple of weeks to hit peak protection, and they will offer that level of protection for a few months after the shot. Keep that in mind as you think about timing your booster for maximum efficacy.

FDA green-lights fall COVID-19 boosters Read More »

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31% of Republicans say vaccines are more dangerous than diseases they prevent

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Vaccines save lives —

The partisan divide on vaccine falsehoods threatens the health of children nationwide.

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Polio victim Larry Montoya is at the airport for the arrival of cases of vaccine, which were distributed as part of the KO Polio campaign, September 5, 1962.

Enlarge / Polio victim Larry Montoya is at the airport for the arrival of cases of vaccine, which were distributed as part of the KO Polio campaign, September 5, 1962.

Public sentiment on the importance of safe, lifesaving childhood vaccines has significantly declined in the US since the pandemic—which appears to be solely due to a nosedive in support from people who are Republican or those who lean Republican, according to new polling data from Gallup.

In 2019, 52 percent of Republican-aligned Americans said it was “extremely important” for parents to get their children vaccinated. Now, that figure is 26 percent, falling by half in just five years. In comparison, 63 percent of Democrats and Democratic leaners said it was “extremely important” this year, down slightly from 67 percent in 2019.

Overall, only 40 percent of Americans now say it is extremely important for parents to vaccinate their children, down from 58 percent in 2019 and 64 percent in 2001.

More broadly, 93 percent of the Democratic group said it was “extremely” or “very” important for parents to vaccinate their children this year, while only 52 percent of the Republican group said the same.

On the other end of the spectrum, 11 percent of the Republican group said vaccinating children was “not important at all,” and an additional 8 percent said it was “not very important.” For the Democratic group, only 1 percent was reported in each of those categories.

Dangerous disinformation

Perhaps most concerning, the data indicated that a growing number of Americans view vaccines as more dangerous than the diseases they prevent—including polio, measles, tetanus, rotavirus, diphtheria, whooping cough, meningitis, and RSV, among others. Now, 20 percent of Americans overall think vaccines are more of a threat than the dangerous diseases they effectively prevent.

The partisan divide is most stark on this sentiment. In 2019, the two parties were about the same. Twelve percent of the Republican group and 10 percent of the Democratic group held this erroneous belief. But now, a whopping 31 percent of the Republican group say vaccines are a more significant threat than dangerous diseases, while the percentage among the Democratic group fell to 5 percent.

Republicans and Republican leaners are much more likely than Democrats and Democratic leaners to believe the false and debunked claim that vaccines are linked to autism—19 percent of the Republican group believe this falsehood compared to 4 percent of the Democratic group.

The polling data aligns with national vaccination trends tracked by the Centers for Disease Control and Prevention. During the pandemic, rates of routine vaccination among kindergartners slipped from the protective target of 95 percent—which prevents infectious diseases from spreading widely—to 93 percent. Additionally, nonmedical exemptions from vaccinations have reached an all-time high of 3 percent nationally. At least 10 states have exemption rates at or above 5 percent, preventing them from reaching the protective target of 95 percent vaccination coverage.

31% of Republicans say vaccines are more dangerous than diseases they prevent Read More »

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Health experts plead for unvaxxed Americans to get measles shot as cases rise

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MMR is safe and effective —

The US hit last year’s total in under 12 weeks, suggesting we’re in for a bad time.

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A view from a hospital as children receiving medical treatment, in capital Kabul, Afghanistan on April 18, 2022. More than 130 children have died from the measles in Afghanistan since the beginning of this year.

Enlarge / A view from a hospital as children receiving medical treatment, in capital Kabul, Afghanistan on April 18, 2022. More than 130 children have died from the measles in Afghanistan since the beginning of this year.

The Centers for Disease Control and Prevention and the American Medical Association sent out separate but similar pleas on Monday for unvaccinated Americans to get vaccinated against the extremely contagious measles virus as vaccination rates have slipped, cases are rising globally and nationally, and the spring-break travel period is beginning.

In the first 12 weeks of 2024, US measles cases have already matched and likely exceeded the case total for all of 2023. According to the CDC, there were 58 measles cases reported from 17 states as of March 14. But media tallies indicate there have been more cases since then, with at least 60 cases now in total, according to CBS News. In 2023, there were 58 cases in 20 states.

“As evident from the confirmed measles cases reported in 17 states so far this year, when individuals are not immunized as a matter of personal preference or misinformation, they put themselves and others at risk of disease—including children too young to be vaccinated, cancer patients, and other immunocompromised people,” AMA President Jesse Ehrenfeld said in a statement urging vaccination Monday.

The latest data indicates that vaccination rates among US kindergarteners have slipped to 93 percent nationally, below the 95 percent target to prevent the spread of the disease. And vaccine exemptions for non-medical reasons have reached an all-time high.

The CDC released a health advisory on Monday also urging measles vaccination. The CDC drove home the point that unvaccinated Americans are largely responsible for importing the virus, and pockets of unvaccinated children in local communities spread it once it’s here. The 58 measles infections that have been reported to the agency so far include cases from seven outbreaks in seven states. Most of the cases are in vaccine-eligible children aged 12 months and older who are unvaccinated. Of the 58 cases, 54 (93 percent) are linked to international travel, and most measles importations are by unvaccinated US residents who travel abroad and bring measles home with them, the CDC flagged.

The situation is likely to worsen as Americans begin spring travel, the CDC suggested. “Many countries, including travel destinations such as Austria, the Philippines, Romania, and the United Kingdom, are experiencing measles outbreaks,” the CDC said. “To prevent measles infection and reduce the risk of community transmission from importation, all US residents traveling internationally, regardless of destination, should be current on their [measles-mumps-rubella (MMR)] vaccinations.” The agency added in a recommendation to parents that “even if not traveling, ensure that children receive all recommended doses of MMR vaccine. Two doses of MMR vaccine provide better protection (97 percent) against measles than one dose (93 percent). Getting MMR vaccine is much safer than getting measles, mumps, or rubella.”

For Americans who are already vaccinated and communities with high vaccination coverage, the risk is low, the CDC noted. “However, pockets of low coverage leave some communities at higher risk for outbreaks.” This, in turn, threatens wider, continuous spread that could overturn the country’s status of having eliminated measles, which was declared in 2000. The US was close to losing its elimination status in 2019 when outbreaks among unvaccinated children drove 1,247 cases across 31 states. Vaccination rates have only fallen since then.

“The reduction in measles vaccination threatens to erase many years of progress as this previously eliminated vaccine-preventable disease returns,” the AMA’s Ehrenfeld warned.

As Ars has reported previously, measles is among the most contagious viruses known and can linger in airspace for up to two hours. Up to 90 percent of unvaccinated people exposed will contract it. Symptoms can include high fever, runny nose, red and watery eyes, and a cough, as well as the hallmark rash. About 1 in 5 unvaccinated people with measles are hospitalized, while 1 in 20 infected children develop pneumonia, and up to 3 in 1,000 children die of the infection. Brain swelling (encephalitis) can occur in 1 in 1,000 children, which can lead to hearing loss and intellectual disabilities. The virus can also destroy immune responses to previous infections—a phenomenon known as “immune amnesia”—which can leave children vulnerable to various other infections for years afterward.

Health experts plead for unvaxxed Americans to get measles shot as cases rise Read More »

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CDC ditches 5-day COVID isolation, argues COVID is becoming flu-like

5-day isolation, CDC, COVID-19, COVID-19 vaccination, flu shots, health, infectious idease, influenza, isolation, respiratory virus, RSV, Science, vaccines / /

New phase —

The agency released a unified “practical” guidance for respiratory viruses.

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A view of the Centers for Disease Control and Prevention headquarters in Atlanta.

Enlarge / A view of the Centers for Disease Control and Prevention headquarters in Atlanta.

COVID-19 is becoming more like the flu and, as such, no longer requires its own virus-specific health rules, the Centers for Disease Control and Prevention said Friday alongside the release of a unified “respiratory virus guide.”

In a lengthy background document, the agency laid out its rationale for consolidating COVID-19 guidance into general guidance for respiratory viruses—including influenza, RSV, adenoviruses, rhinoviruses, enteroviruses, and others, though specifically not measles. The agency also noted the guidance does not apply to health care settings and outbreak scenarios.

“COVID-19 remains an important public health threat, but it is no longer the emergency that it once was, and its health impacts increasingly resemble those of other respiratory viral illnesses, including influenza and RSV,” the agency wrote.

The most notable change in the new guidance is the previously reported decision to no longer recommend a minimum five-day isolation period for those infected with the pandemic coronavirus, SARS-CoV-2. Instead, the new isolation guidance is based on symptoms, which matches long-standing isolation guidance for other respiratory viruses, including influenza.

“The updated Respiratory Virus Guidance recommends people with respiratory virus symptoms that are not better explained by another cause stay home and away from others until at least 24 hours after both resolution of fever AND overall symptom are getting better,” the document states. “This recommendation addresses the period of greatest infectiousness and highest viral load for most people, which is typically in the first few days of illness and when symptoms, including fever, are worst.”

“Residual risk”

The CDC acknowledged that the eased isolation guidance will create “residual risk of SARS-CoV-2 transmission,” and that most people are no longer infectious only after 8 to 10 days. As such, the agency urged people to follow additional interventions—including masking, testing, distancing, hygiene, and improving air quality—for five additional days after their isolation period.

“Today’s announcement reflects the progress we have made in protecting against severe illness from COVID-19,” CDC Director Dr. Mandy Cohen said in a statement. “However, we still must use the commonsense solutions we know work to protect ourselves and others from serious illness from respiratory viruses—this includes vaccination, treatment, and staying home when we get sick.”

Overall, the agency argued that a shorter isolation period would be inconsequential. Other countries and states that have similarly abandoned fixed isolation times did not see jumps in COVID-19 emergency department visits or hospitalizations, the CDC pointed out. And most people who have COVID-19 don’t know they have it anyway, making COVID-19-specific guidance moot, the agency argued. In a recent CDC survey, less than half of people said they would test for SARS-CoV-2 if they had a cough or cold symptoms, and less than 10 percent said they would go to a pharmacy or health care provider to get tested. Meanwhile, “The overall sensitivity of COVID-19 antigen tests is relatively low and even lower in individuals with only mild symptoms,” the agency said.

The CDC also raised practical concerns for isolation, including a lack of paid sick leave for many, social isolation, and “societal costs.”

The points are likely to land poorly with critics.

“The CDC is again prioritizing short-term business interests over our health by caving to employer pressure on COVID guidelines. This is a pattern we’ve seen throughout the pandemic,” Lara Jirmanus, Clinical Instructor of Medicine at Harvard Medical School, said in a press release last month after the news first broke of the CDC’s planned isolation update. Jirmanus is a member of the People’s CDC, a group that advocates for more aggressive COVID-19 policies, which put out the press release.

Another member of the group, Sam Friedman, a professor of population health at NYU Grossman School of Medicine, also blasted the CDC’s stance last month. The guidance will “make workplaces and public spaces even more unsafe for everyone, particularly for people who are high-risk for COVID complications,” he said.

COVID and flu

But, the CDC argues that the threat of COVID-19 is fading. Hospitalizations, deaths, prevalence of long COVID, and COVID-19 complications in children (MIS-C) are all down. COVID-19 vaccines are safe and effective at preventing severe disease, death, and to some extent, long COVID—we just need more people to get them. Over 95 percent of adults hospitalized with COVID-19 in the 2023–2024 respiratory season had no record of receiving the seasonal booster dose, the agency noted. Only 22 percent of adults got the latest shot, including only 42 percent of people ages 65 and older. In contrast, 48 percent of adults got the latest flu shot, including 73 percent of people ages 65 and older.

But even with the crummy vaccination rates for COVID-19, a mix of past infection and shots have led to a substantial protection in the overall population. The CDC even went as far as arguing that COVID-19 deaths have fallen to a level that is similar to what’s seen with flu.

“Reported deaths involving COVID-19 are several-fold greater than those reported to involve influenza and RSV. However, influenza and likely RSV are often underreported as causes of death,” the CDC said. In the 2022–2023 respiratory virus season, there were nearly 90,000 reported COVID-19 deaths. For flu, there were 9,559 reported deaths, but the CDC estimates the true number to be between 18,000 and 97,000. In the current season, there have been 32,949 reported COVID-19 deaths to date and 5,854 reported flu deaths, but the agency estimates the real flu deaths are between 17,000 and 50,000.

“Total COVID-19 deaths, accounting for underreporting, are likely to be higher than, but of the same order of magnitude as, total influenza deaths,” the agency concluded.

In all, the CDC was ready to fold SARS-CoV-2 into the gang of common seasonal respiratory viruses, with most cases mild and undiagnosed. “Viruses cause most acute respiratory illnesses, but it is rarely possible to determine the type of virus without testing, and oftentimes testing does not change clinical management,” the agency wrote.

CDC ditches 5-day COVID isolation, argues COVID is becoming flu-like Read More »

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Unvaccinated Florida kids exposed to measles can skip quarantine, officials say

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Bad idea —

On Tuesday, nearly 20 percent of the school’s 1,067 students were reportedly absent.

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Florida Surgeon General Dr. Joseph Ladapo speaks during a press conference at Neo City Academy in Kissimmee, Florida.

Enlarge / Florida Surgeon General Dr. Joseph Ladapo speaks during a press conference at Neo City Academy in Kissimmee, Florida.

Paul Hennessy/SOPA Images/LightRocket via Getty Images

A sixth student at Florida’s Manatee Bay Elementary School outside of Fort Lauderdale has a confirmed case of measles, health officials announced late Tuesday. However, health officials are not telling unvaccinated students who were potentially exposed to quarantine.

The school has a low vaccination rate, suggesting that the extremely contagious virus could spark a yet larger outbreak. But in a letter sent to parents late Tuesday, Florida Surgeon General Joseph Ladapo—known for spreading anti-vaccine rhetoric and vaccine misinformation—indicated that unvaccinated students can skip the normally recommended quarantine period.

The letter, signed by Ladapo, noted that people with measles can be contagious from four days before the rash develops through four days after the rash appears. And while symptoms often develop between 8 to 14 days after exposure, the disease can take 21 days to appear. As such, the normal quarantine period for exposed and unvaccinated people, who are highly susceptible to measles, is 21 days.

“Because of the high likelihood of infection, it is normally recommended that children stay home until the end of the infectious period, which is currently March 7, 2024,” Ladapo’s letter states, adding that the date could change as the situation develops. “However, due to the high immunity rate in the community, as well as the burden on families and educational costs of healthy children missing school, [the health department] is deferring to parents or guardians to make decisions about school attendance.”

Local media outlets reported that, on Tuesday, more than 200 of the school’s 1,067 students were absent.

The measles cluster began Friday when a third grader, who had not recently traveled, was diagnosed with the vaccine-preventable illness. Over the weekend, three additional cases were identified, leading the local health department to release a health advisory. Two additional cases were identified this week. It’s unclear if all six children are unvaccinated.

According to a county vaccine study, only 89.31 percent of the school’s students were vaccinated in the 2023/2024 school year, suggesting that around 114 students are susceptible due to their vaccination status.

The measles virus spreads easily through respiratory transmission and can linger in air space for up to two hours after an infected person has been in an area. Among people susceptible to the virus—those who are unvaccinated or have compromised immune systems—up to 90 percent will become infected upon exposure. People who are fully vaccinated, meanwhile, are considered protected. Two doses of the Measles, Mumps, and Rubella (MMR) vaccine are 97 percent effective at preventing the disease.

Measles symptoms include high fever, runny nose, red and watery eyes, and a cough, as well as a telltale rash that develops after initial symptoms. About 1 in 5 unvaccinated people with measles are hospitalized, according to the Centers for Disease Control and Prevention, while 1 in 20 infected children develop pneumonia and up to 3 in 1,000 children die of the infection.

Unvaccinated Florida kids exposed to measles can skip quarantine, officials say Read More »

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Measles is “growing global threat,” CDC tells doctors in alert message

CDC, health, Infectious disease, measles, MMR vaccines, outbreak, pandemic, Science, vaccines, WHO / /

Alert —

Since December, there have been 23 measles cases in the US, including two outbreaks.

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A baby with measles.

Enlarge / A baby with measles.

The Centers for Disease Control and Prevention is putting clinicians on alert about the growing risk of measles cases and outbreaks amid a global surge in transmission.

In an outreach message sent Thursday, the CDC told clinicians to look out for patients who have a rash accompanied by a fever and other symptoms of measles, as well as patients who have recently traveled to countries with ongoing measles outbreaks.

Between December 1, 2023, and January 23, 2024, there have been 23 confirmed measles cases in the US, including seven direct importations by international travelers and two outbreaks with more than five cases each, the CDC noted. Most of the cases were in unvaccinated children and teens.

Measles outbreaks in the US are typically sparked by unvaccinated or undervaccinated US residents who pick up the infection abroad and then, when they return, transmit the disease to pockets of their communities that are also unvaccinated or undervaccinated.

Globally and in the US, vaccination rates against measles—via the measles, mumps, and rubella vaccine (MMR)—have fallen in recent years due to pandemic-related health care disruption and vaccine hesitancy fueled by misinformation.

“The increased number of measles importations seen in recent weeks is reflective of a rise in global measles cases and a growing global threat from the disease,” the CDC’s outreach message, titled “Stay Alert for Measles Cases,” read.

According to data from the World Health Organization, the European region saw an over 40-fold rise in measles cases in 2023 as compared with 2022. The region tallied over 42,200 measles cases last year, compared with just 941 in 2022.

This week, the WHO reported a rapid escalation of measles cases in Kazakhstan (which the WHO considers part of the European region). Kazakhstan has recorded the highest incidence of measles cases in the region, with 13,677 cases in 2023. That corresponds to over 639 cases per million in the population. In the news release Tuesday, Kazakhstan’s health minister reported that there are “currently 2,167 children in hospital with measles, 27 of them in a serious condition.”

The outbreak is largely spurred by unvaccinated children who missed their routine immunizations during the pandemic. Sixty-five percent of the reported measles cases are in children under age 5, the WHO noted. The country is now trying to catch children up on their vaccines to curb the outbreak.

“Measles is highly infectious, but fortunately, can be effectively prevented through vaccination,” WHO’s Regional Director for Europe, Hans Henri P. Kluge, said in the news release. “I commend Kazakhstan for the urgent measures being taken to stop the spread of this dangerous disease.”

Meanwhile, measles is flaring up in many other places. Last week, the UK Health Security Agency warned of the potential for an ongoing measles outbreak to spread. As of January 18, there were 216 confirmed cases and 103 probable cases in the West Midlands region since October 2023. Authorities warned that any areas with low MMR vaccination rates are at risk of an outbreak.

The vast majority of Americans have received their MMR vaccines on schedule. In this case, the two standard, recommended doses are considered 97 percent effective against measles, and the protection is considered for life. But anyone who is unvaccinated or undervaccinated is at high risk of infection in the event of an exposure. The virus can linger in air space for up to two hours after an infected person leaves the area, the CDC notes, and is highly infectious—up to 90 percent of unvaccinated people exposed will fall ill. Once infected, people are infectious from four days before the telltale measles rash develops to four days afterward.

Measles is “growing global threat,” CDC tells doctors in alert message Read More »

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CDC reports dips in flu, COVID-19, and RSV—though levels still very high

annual flu shot, CDC, COVID-19, deaths, flu season, health, influenza, influenza-like illness, respiratory viruses, RSV, Science, vaccines / /

a break? —

The dips may be due to holiday lulls and CDC is monitoring for post-holiday increase.

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The influenza virus from an image produced from an image taken with transmission electron microscopy. Viral diameter ranges from around 80 to 120 nm.

Enlarge / The influenza virus from an image produced from an image taken with transmission electron microscopy. Viral diameter ranges from around 80 to 120 nm.

Key indicators of seasonal flu activity declined in the first week of the year, signaling a possible reprieve from the high levels of respiratory virus transmission this season—but the dip may only be temporary.

On Friday, the Centers for Disease Control and Prevention released its latest flu data for the week ending on January 6. Outpatient visits for influenza-like illnesses (ILI) were down that week, the first decline after weeks of rapid increases. Flu test positivity and hospitalizations were also down slightly.

Percent of outpatient visits for respiratory illnesses by week.

Enlarge / Percent of outpatient visits for respiratory illnesses by week.

But transmission is still elevated around the country. Fourteen states have ILI activity at the “very high” level in the current data, down from 22 the week before. And 23 states have “high” activity level, up from 19 the week before. (You can see the week-by-week progression of this year’s flu season in the US here.)

The CDC says it is monitoring for “a second period of increased influenza activity that often occurs after the winter holidays.”

Map of ILI activity by state.

Enlarge / Map of ILI activity by state.

Flu isn’t the only virus that seems to be letting up a little in the data, at least for now. COVID-19 data also showed some dips, with the CDC reporting that “Despite test positivity (percentage of tests conducted that were positive), emergency department visits, and hospitalizations remaining elevated nationally, the rates have stabilized, or in some instances decreased, after multiple weeks of continual increase.”

The CDC speculates that some of the declines in indicators could be due to people not seeking medical care during the holidays as they would otherwise. COVID-19 wastewater activity levels remain “very high,” with all regions showing high or increasing levels. The South and Midwest have the highest levels in the latest data, but there are some early indications that rises in the Midwest and Northeast may be slowing down.

Meanwhile, RSV activity remains elevated, though some areas are starting to see declines.

The CDC notes that it’s not too late to get vaccinated against COVID-19, flu, and (for those ages 60 and over) RSV. So far, 21 percent of adults have received the 2023–2024 COVID-19 vaccine, including 41.5 percent of people ages 65 and up. Around 363,000 people have died from COVID-19 in the US since September.

For flu, about 47 percent of adults have received their annual shot, including 74 percent of people ages 65 and up. On Thursday, researchers in Canada published the first estimates of flu vaccine effectiveness this season, finding the current annual shots are 61 percent effective against the most common strain of flu circulating in the US (influenza A(H1N1)pdm09) and 49 percent effective against the less common influenza A(H3N2) and 75 percent effective against influenza B.

The CDC estimates that there have been at least 14 million flu cases, 150,000 hospitalizations, and 9,400 deaths from flu so far this season so far, the agency reported. In the first week of this year, 13 children died of flu, bringing this season’s total to 40.

CDC reports dips in flu, COVID-19, and RSV—though levels still very high Read More »