A pesky mosquito lands on your arm and drinks some of your blood. It leaves behind an itchy bump, but if that's all it leaves behind, you should be happy. Every year, mosquitoes infect millions of people with deadly diseases!
Hopefully, the worst thing your pet ever comes home with is bad breath. But some furry friends can carry nasty germs, and that's where zoonotic disease researchers come in and investigate and stop animal diseases before they get you!
Bacteria are the most common living things on earth and you carry them wherever you go. Most of them couldn't hurt a flea, but if conditions are just right, they can cause big problems!
