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Ancient part of immune system may underpin severe COVID

New genetic and patient analyses suggest severe COVID is linked to overactive complement, one of the immune system's oldest branches, and excess blood clotting.

Inexpensive, accessible device provides visual proof that masks block droplets

In a proof-of-concept study, researchers report that a simple, low-cost technique provided visual proof that face masks are effective in reducing droplet emissions during normal wear.They found that the best face coverings were N95 masks without valves -- the hospital-grade coverings that are used by front-line health care workers.

Hydroxychloroquine can’t stop COVID-19. It’s time to move on, scientists say

An abundance of scientific data shows that the drug isn’t an effective COVID-19 treatment

When Schluger first heard about hydroxychloroquine, he hoped it would work for his patients. He and colleagues prescribed the antimalarial drug for 811 of the 1,446 patients hospitalized at the medical center from March 7 to April 8. But the drug didn’t seem to help, Schluger and colleagues reported May 17 in the New England Journal of Medicine.