C.D.C. Links Measles Outbreaks in Multiple States for First Time

If the outbreaks cannot be extinguished by January, the anniversary of the first cases in Texas, the United States will lose what is known as “elimination status” as determined by the World Health Organization.

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Canada Loses Its Status as Having Eliminated Measles

The disease was once considered eliminated in Canada, but not any more — there have been more than 5,000 cases in the last 12 months as vaccination rates have fallen.

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More Than 100 Cases of Measles Reported in Utah and Arizona

In the hardest-hit counties, childhood vaccination rates steeply declined during the pandemic.

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C.D.C. Layoffs Included 2 Top Measles Experts Amid Rising Cases

Scientists who focused on other infectious diseases, like an Ebola outbreak in the Democratic Republic of Congo, also were let go.

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In Texas, Parents Fighting Vaccinations Say Their Movement Is Winning

Public health advocates hoped that the measles outbreak might persuade the reluctant to get shots. That has not turned out to be true.

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Scientists Begin Testing Bird Flu Vaccine in Seals

If the results are promising, veterinarians hope to give the shots to wild Hawaiian monk seals, which are endangered.

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What to Know About Jim O’Neill, the New Acting C.D.C. Director

The selection of Jim O’Neill, a former Silicon Valley executive, drew objections from Democrats, who noted his lack of medical or scientific training.

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Why Young Children May Not Get Covid Shots This Fall

Under Robert F. Kennedy Jr., federal officials may withdraw an endorsement for the vaccine in younger children.

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Measles Spreads Quickly in Rural Alberta Areas That Resisted Vaccines

The virus is spreading in insular Mennonite communities. But the broader population is vulnerable as vaccine rates have fallen across the Canadian province since the Covid-19 pandemic.

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China’s Fight Against Chikungunya Virus Tests a City’s Post-Covid Patience

The authorities are inspecting homes, tracking purchases of fever medicines and deploying drones as they urge people to join an eradication campaign that echoes Covid measures.

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