You called in sick yesterday because you thought you had the flu, but today you feel even worse. You have heavy bleeding and delirium because you’ve got one of the world’s most deadly viruses. What ...

Scientists discovered that vesper bats have a unique immune system that may help them respond to many different viruses.

Add Yahoo as a preferred source to see more of our stories on Google. Woman applying insect repellent against mosquito and tick on her leg during hike in nature. Skin protection against insect bite© ...