Pneumonia is a term that refers to inflammation of the lung. Bacterial pneumonia means that the inflammation is caused by a bacterial infection. This video takes a look at the possible causes and recommended treatments.

Hepatitis is an inflammation of the liver. The hepatitis A virus is one of five that cause this disease. This video takes a closer look at hepatitis A how it is spread and what you can do to prevent its transmission.

Hepatitis B is one of five virus types that cause hepatitis, an inflammation of the liver. Hepatitis B is considered a sexually transmitted disease. This video takes an in-depth look at hepatitis B how common it is, how it is spread, and what you can do to prevent its transmission.

The hepatitis C virus is another type of hepatitis virus that causes an inflammation of the liver. HCV is transmitted though exposure to infected blood or blood products. In this video, you'll find out more about how it's transmitted, what treatments are available, and what you can do to protect yourself from this disease.

Herpes simplex is a virus in the family of viruses that cause chickenpox, shingles, and mononucleosis. One type of the herpes virus causes cold sores around the mouth; another type causes genital herpes. This video looks at the types of herpes simplex and what you can do to prevent their spread.

Herpes zoster, also known as shingles, is an uncomfortable and often very painful outbreak of skin blisters and sores. The condition is caused by the varicella-zoster virus, the same virus that causes chickenpox. This video explains how shingles develop, what treatment is available, and preventive steps to take, including vaccination.

Impetigo is a mild skin infection seen most frequently in children. It is caused by skin bacteria, usually staph (staphylococci) or strep (streptococci). This video takes a closer look at this contagious disease.

Lyme disease is an illness spread by the bite of an infected tick. A bull's-eye rash is a typical symptom that identifies this illness, which untreated can affect many parts of the body. This video explains how the illness develops and what you can do to protect yourself against tick bites.

Mononucleosis is an acute infectious disease that affects the respiratory system, the liver, and the lymphatic system. It is caused by the Epstein-Barr virus. This video looks at who is at risk for this infection and typical symptoms to watch for.

A spinal tap, also called lumbar puncture, is used to take a sample of the fluid from the spinal column to look for infection or bleeding. The most common reasons people need this procedure include severe headache, fever with a stiff neck or vomiting, or confusion. Watch this video to learn what happens during this procedure.