B00-B09: Viral infections characterized by skin and mucous membrane lesions

B03: Smallpox

In 1980 smallpox was declared eradicated. It is caused by viruses. The viruses can be transmitted by coughing or sneezing, for example.

Early in the illness you may have fever, with headaches and back pain. You may also have a sore throat.

Smallpox typically appears as bumps on the skin. Over time the bumps develop into pus-filled blisters. The blisters then heal and usually leave scars behind.