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Meningitis Symptoms in Adults 

Meningitis is a potentially fatal infection. Meningitis symptoms in adults are often different than meningitis symptoms in children. Here's what you should know.

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What Is Rotavirus? 

A highly contagious infection, rotavirus causes severe diarrhea and, in the past, killed up to 60 unvaccinated American children under age five each year.

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What Is C. diff?  

When people ask, “What is C. diff?” they are really asking two questions: One: What is the illness like and, two, what causes it. Learn more.

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What Is Walking Pneumonia? 

Walking pneumonia can cause mild symptoms but also have serious consequences. Learn what is walking pneumonia, treatment, and how to avoid the infection.

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How Do You Get Cellulitis? 

Cellulitis causes pain, blindness, even death. How do you get cellulitis? Find out your risk and how to treat this skin dangerous infection.

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What Is AIDS? 

In the late stage of an infection with the HIV virus, called AIDS (acquired immunodeficiency syndrome), your immune system cannot fight off infections normally.

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Are Sinus Infections Contagious?  

Sinus infections are contagious only if they are caused by a virus, rather than bacteria, fungi, allergies, or other causes. Here's what everyone should know.

Doctor examining patient's lymph nodes --- Image by © Kate Kunz/Corbis

Strep Throat in Adults 

Strep throat is common in kids but strep throat in adults does occur — and it can be serious. Learn about symptoms, testing, and how to protect yourself.

What Is Scarlet Fever?  

Children who get a red sandpapery rash along with a fever may have scarlatina, a bacterial infection that can lead to rheumatic fever, kidney disease, ear infections, and pneumonia.

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Food Poisoning Symptoms 

Foodborne illnesses affect millions of people every year. Learn about the symptoms of food poisoning and how to avoid them to stay healthy.