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.

The virus that causes mpox was first discovered at the end of the 1950s, but it has undergone changes in the past four years that allow it to pass between humans more easily.

Viruses have traditionally been named after the places or animals they have been first discovered in. Now scientists are trying to bring order to the chaos of virus naming.

With a new variant of the Sars-CoV-2 virus causing a spike in cases, it is showing just how much symptoms of the disease have changed since the pandemic began.

Bird flu has been detected widely in pasteurised milk products in the US. We asked experts about the safety of drinking pasteurised and raw milk.

A genetic quirk protects some people from the winter vomiting bug. Can vaccines help the rest of us?