The team behind the new guidance also emphasized how important it still is for all adults to get vaccinated. 

The median time from a positive serological test result to acute ischemic stroke was nearly 55 days. 

Six healthcare organizations, including the American College of Cardiology and American Heart Association, signed the letter. 

Researchers presented new data from the North American COVID-19 Myocardial Infarction registry, detailing the ongoing pandemic's "deadly impact." 

Tommy Sweeney was the first NFL player to come down with myocarditis following a case of COVID-19, missing the rest of the 2020 season after his diagnosis in November.

The study's authors warned that excess deaths may continue to rise if states don't learn any lessons from the last year. 

The pandemic made a clear impact on physician prescription and ordering practices. Will these things return to normal as more and more people continue to get vaccinated? 

The FDA and CDC announced the recommendation in a new joint statement. Nearly 7 million doses of the Johnson & Johnson vaccine have been administered in the United States so far. 

These blood clots have been responsible for a total of 18 deaths. Experts have continued to emphasize that the benefits of vaccination still outweigh the risks.