Question: I know that it's possible for the body's immune system to attack new cells such as a transplanted heart, how can we overcome this problem? Can we?

Well, you might know that some people can get an organ transplant, like a kidney or a liver or even a heart, and we have special drugs called “anti-rejection drugs” that help the mode not to “reject” or kill the organ!

These drugs turn the immune system down a bit, and stop it from attacking the new organ!

But when we turn the immune system down a bit, of course, other bugs like colds and flus can get in, so it’s important for people on these drugs to be careful around people with other illnesses.