(NEXSTAR) – The map of flu activity across the United States continues to darken, both figuratively and literally, as case ...

Dengue fever is a viral infection transmitted by the Aedes aegypti mosquito, which bites during the day. In most cases, it causes sudden high fever, severe headache, pain in muscles, joints and bones, ...

A dangerous bird flu, in other words ... seals and dolphins. Thus far, the United States is the only nation with H5N1 in cows; it's shown up in dairies in at least 17 states.