A nasty, highly contagious virus is spreading across the country ahead of the holiday season — and it’s not the flu or Covid. Norovirus, also called the “winter vomiting disease,” has been rising across the nation since as early as mid-October ...

New research shows that after the body's defenses kill the virus behind COVID-19, leftover digested chunks of SARS-CoV-2 spike protein can target specific immune cells based on their shape. The revelations could explain why certain populations of cells that detect and fight infection are depleted in patients with severe COVID-19,

In space, bacteriophages mutate in ways not seen on Earth, making them more effective at killing drug-resistant bacteria.