Hepatitis C is a liver disease caused by a virus. Although it is a liver disease, hepatitis C also has certain effects on other areas of the body, including the skin.

Diphtheria is an infectious, toxic disease caused by diphtheria bacteria. The disease is easily spread from sick people to healthy people through the respiratory tract. The symptoms of the disease are easily confused with the common cold.

Polio is a dangerous infectious disease. Children who contract the disease can die or be left with lifelong paralysis and disability. Currently, there is a vaccine to prevent polio.