Viruses

A person tested positive for avian influenza after being exposed to cows thought to be infected with the virus. It's the second time a human has been infected with H5N1 in the U.S.

New research shows that CRISPR, the gene editing technique, could make chickens more resistant to bird flu. But its use raises many ethical and scientific issues

In states with high rates of Lyme disease, new reporting guidelines have revealed tens of thousands of previously overlooked cases--giving scientists a better understanding of the public health threat

By ignoring common sense and medical advice, Florida’s health officials risk accelerating a burgeoning measles outbreak

Rod-shaped fragments of RNA called “obelisks” were discovered in gut and mouth bacteria for the first time

Measles cases have ticked up in the U.K. following lower rates of MMR vaccination, and the U.S. could see similar outbreaks

Measles is extremely infectious. Vaccines provide good protection, but some adults may need a top-up shot

A surge in respiratory disease in China appears to be caused by known pathogens, but the pattern of infections is still unusual

Novavax’s protein-based vaccine is the latest FDA-authorized COVID booster available this fall. Here’s what you should know

After avian influenza killed 21 endangered California Condors, government officials are testing a vaccine that could protect the massive scavengers from infection

Global efforts to eradicate the poliovirus were recently described as unsuccessful—yet Afghanistan and Pakistan are now on the verge of eliminating it