Viruses

The H5N1 virus is a long way from becoming adapted to humans, but limited testing and tracking mean we could miss danger signs

The U.S. government has a stockpile of H5N1 vaccines, and several companies could make millions more if needed. But scaling up the supply could take time

Certain adults may need to get an additional dose of the measles vaccine. Here’s how to know if you have adequate immunity to measles

Genomic analysis suggests that the outbreak probably began in December or January, but a shortage of data is hampering efforts to pin down the source

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