Tetanus is an infection that affects the nervous system. It's also called lockjaw. Most children are vaccinated against it, but that immunity wears off with time. Adults need a booster shot to maintain their immunity.

Thanks to vaccines, most U.S. children are protected against serious diseases such as measles, mumps, diphtheria, polio, and chickenpox. But what happens to that protection in adolescence?

Tattooing has been performed as a decorative practice since ancient times. It is now also being used for some cosmetic medical procedures and for permanent make-up applications.

The vast majority of rabies cases reported to the CDC each year occur in wild animals like raccoons, skunks, bats, and foxes.

The health consequences of using smokeless tobacco include increased heart rate, high blood pressure, irregular heartbeat, and mouth sores.

Smallpox was once found throughout the world, causing illness and death wherever it occurred.

You don't have to be reminded about the aging process. It's inevitable. But just because you're over 50 doesn't mean you can't be fit. Learn more about senior fitness by taking this quiz.

Prescription medicines can work wonders when they are taken as they should be. But what happens when you miss a dose? Or when you want to take an over-the-counter medicine along with your prescription? See if you know the answers to these and other questions by taking this quiz.

Poisons can be solids, liquids, sprays, or gases. Learn more about accidental poisonings by taking this quiz.

Houseplants help keep your indoor air clean, make a dramatic statement in your interior design, and provide a sense of well-being around the house. But some plants can poison children or pets.