Immune and infectious diseases Archive

Mononucleosis can affect more than energy levels. Activity choices matter during illness, especially when the spleen may be enlarged.

Vaccines can contain different forms of viruses, and the choice may affect how your immune system responds and which vaccine is right for you.

A red, tingling tongue can have several possible triggers, from everyday irritants to health conditions that may need medical attention.

Scarlet fever can bring a telltale rash, fever, and sore throat. Explore how it spreads, how it’s treated, and what recovery may involve.

Learn what an unexpected shift in white blood cells may mean and when it deserves a closer look with your doctor.

The FDA approved Moderna's mFLUSIVA, the first mRNA flu vaccine, for adults ages 50 and older. Trials showed it outperformed traditional flu shots in preventing infection, though with a higher rate of side effects. It’s expected to be available in time for flu season.

A lower-than-usual white blood cell count is often temporary, especially after illness. Find out what your number may mean and when retesting might be needed.

Several factors increase the risk for complications from COVID-19 or influenza and should prompt someone to request an antiviral medication as soon as possible, even if they have been vaccinated or have had the infections before. The risk factors are age (being 65 or older), an impaired immune system, and underlying conditions (especially heart or lung disease). Pregnant women also are at increased risk for severe influenza and COVID, and should consider taking an antiviral.

The most common problems detected with a stethoscope are conditions that affect one of your heart valves—usually the aortic valve or the mitral valve. While often harmless, these problems sometimes require monitoring and treatment.