The delay, narrowed approval, and extra study steps raise concerns about the status of and potential added requirements for other COVID vaccines.
Plaque growth can lead to a higher risk of heart attack, stroke, and other life-threatening cardiovascular events for as long as 1 year.
Post-exertional malaise, or exercise intolerance, was seen in 36% of those with long COVID.
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The CDC says vaccines are "one of the most critical strategies to help schools safely resume full operations."
The vaccine had good efficacy against infection and severe disease, but lower than with mRNA vaccines.
Sixteen African nations report resurgences, and cases have more than doubled in some European countries.
In Orange County, California, COVID-19 vaccination in healthcare personnel (HCP) was connected with a 94% reduction in HCP cases 3 weeks after second doses of mRNA-based vaccines were administered, according to a JAMA Network Open research letter yesterday.
The US COVID-19 vaccination program may have saved almost 280,000 lives and prevented 1.25 million hospitalizations, according to the results of a modeling study published yesterday by the Commonwealth Fund.
Also, global deaths pass 4 million, led by the United States, India, and Brazil.
"We are now starting to see new and concerning trends in cases," CDC Director Rochelle Walensky says.
Recommendations include bolstering worker well-being, reassessing priorities, and admitting when data are lacking.
The hospitals with the highest caseloads had double the risk of COVID-related death.
WHO officials said variant spread could outpace vaccines, even in countries with high vaccine coverage.
