Disease-causing microorganisms churn in the floodwaters after a hurricane and grow in people's homes long after the first danger has passed.

A couple is raising awareness of a rare condition after losing an unborn child during pregnancy.

Microglia are the brain's resident immune cells. Their job is to patrol the brain's blood vessels looking for invading pathogens to gobble up. But what happens when they go rogue?

The new study uses genome sequencing to detect more diseases earlier, when they can still be treated.

Our sheets and pillows are where we spend a third of our daily lives, and all that contact creates the perfect environment for all sorts of unwanted guests.

West Nile virus, Eastern equine encephalitis (EEE), malaria and dengue are gaining new ground in the US. The mosquitoes that carry these diseases are thriving in a warming world.

West Nile virus is spreading across the US and Europe. This deadly disease has been around for decades, but there is still no vaccine and no cure in humans.

A mysterious virus once confined to the Amazon is now spreading more widely around the Americas, after undergoing genetic changes that may make it more potent.