You may worry about catching a cold on an airplane or in an elevator full of snifflers. But what about in your own house? Here are the spots in your home where cold and flu viruses can hide—along with expert advice on how to outsmart them.

With all the sick people, healthcare workers, and visitors filing in and out, hospitals can be germy places. Be doubly sure to wash up after touching any of these especially dirty spots.

Unlike the common cold—which, although miserable, usually doesn't hurt anyone—influenza can be serious business. Here's what not to do if you get the flu this year.