Infectious Disease

An analysis of mice in the Big Apple finds that many harbor bacteria that can make humans sick if exposed to the animals' droppings. Some of the bacterial strains were resistant to antibiotics.

There's a new fear from climate change: bacteria and viruses buried in frozen ground coming back to life as the Arctic warms up. We went digging in permafrost to find out how worried we should be.

The flu season started early this year and is already widespread throughout the country and intense in dozens of states. But it's not too late to get that flu shot, officials say.

After an unusual three-year moratorium, the federal government says it will once again allow research on deadly viruses that could spark pandemics. The work has sparked concerns about bioterrorism.