BK virus

The BK virus is a teeny-tiny microbe that can sometimes make people sick. It's so small that you can't even see it with your eyes! The virus lives in your body and usually doesn't make you sick, but sometimes it can cause problems.

It's found in lots of grownups and kids too, and it's often in your pee-pee or in your poopy. Yuck! You might even have had the BK virus before, but you didn't even know it because it wasn't making you sick.

Sometimes things can happen to make the BK virus wake up and start causing problems. This can happen when your body is really sick or your immune system isn't working right. When that happens, the virus can start to grow too much and make you feel sick or have a fever.

Doctors can test for the BK virus to see if it's causing problems. And if it is, they can give you medicine to help make you feel better. So if you ever hear about the BK virus, don't worry too much! Just remember that it's a very tiny germ that can cause problems sometimes, but doctors know how to take care of it.