The CDC recommends that everyone ages 13 to 64 get a routine HIV test at least once.

Hepatitis A and E usually resolve on their own, but hepatitis B and C can cause serious liver disease, including cirrhosis and liver cancer.

Long-lived memory immune cells continue to provide protection even after antibody levels drop.

New guidelines recommend focusing on healthy foods but don’t restrict added sugars or alcohol as much as some experts had hoped.

Disruptions in prevention and care could threaten progress toward ending the HIV epidemic.

Vaccine development is proceeding at an unprecedented pace, but could still hit snags on the way to approval.

Try to do at least 150 minutes of moderate-intensity physical activity every week.

These three respiratory illnesses share many of the same symptoms.

Different types of white blood cells provide protection against infections and cancer.

Many people with fatty liver disease have obesity, diabetes and other metabolic conditions.