Viral Diseases of the Digestive System Mumps. The virus that causes mumps contains RNA. Transmitted in saliva and respiratory secretions, it replicates in the host's respiratory tract and causes swelling of one or both of the parotid glands below the ear and near the angle of the jaw. Fever is sometimes present, and in adult males, complications may occur if the virus infects the testis. Inflammation of the testis is called orchitis. Immunity to mumps is rendered by an injection of the MMR vaccine , using attenuated mumps virus. Hepatitis A. Hepatitis A is caused by an RNA virus usually placed in the Picornaviridae family. The virus passes among individuals by the fecal-oral route, and the disease is sometimes called infectious hepatitis. Individuals are contagious before they display symptoms and after symptoms have lessened. Contaminated food and water are often involved.
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.