What Krug discovered was the way that one of the 14 proteins in the flu virus replicates itself. He calls the process "cap snatching," and it's something that is relatively unusual in human viruses.

A version of this article first appeared in CNBC's Healthy Returns newsletter, which brings the latest health-care news ...

Compared to the standard shot, the mRNA vaccine had an overall vaccine efficacy that was 26.6 percent higher, and 27.4 ...

The flu virtually disappeared for two years as the pandemic raged. But influenza appears poised to stage a comeback this year in the U.S., threatening to cause a long-feared "twindemic." ...

Seasonal Flu Vaccine. Also starting from October 1st, the flu vaccination campaign is mainly aimed at those over 60, vulnerable people, and children up to 6 years old; while the anti-pneumococcal ...

If the agency does, it would affect roughly 4% to 5% of the U.S. flu vaccine supply. The rest of the nation's flu shots were thimerosal-free during the last season of the virus, according to CDC data.