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Millions of people in dozens of countries have received the AstraZeneca Covid vaccine with few reports of ill effects, and its prior testing in tens of thousands of people found it to be safe.

But recently, blood clots and abnormal bleeding in a small number of vaccine recipients in European countries have cast doubt on its safety, although no causative link has been found between the patients’ conditions and the vaccine. The reports have prompted more than a dozen countries to either partly or fully suspend the vaccine’s use while the cases are investigated. Most of the nations said they were doing so as a precaution until leading health agencies could review the cases.

Puerto Rico enacted strict Covid measures. It paid off, and it's a lesson for the mainland. Puerto Rico used curfews and rigorous sanitary measures, "and the pandemic was never politicized," a health expert said. It saved lives — and its health care system. NBC News

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Stunning analysis traces new Ebola outbreak to survivor of W. Africa crisis The analysis suggests that a survivor of the historic Ebola outbreak continued shedding the virus at least five years after being infected. Helen Branswell STAT

A survivor of the massive 2014-2016 West African Ebola outbreak almost certainly triggered an outbreak currently underway in Guinea, according to a new genetic analysis, news that has landed like a bombshell in the community of researchers who study the dangerous virus.