Viral diarrhea.

Viral diarrhea is a frequent, self-limited illness that may occur sporadically or in epidemic fashion. Nosocomial outbreaks have been reported. Rotavirus and Norwalk virus are the two most important agents causing this disease. Clinical illness is usually mild but may be quite severe in selected infants or elderly or debilitated persons. Specific diagnosis has been advanced by the use of immunoassays. Treatment is supportive, and most patients recover completely. Good hygienic measures are effective in preventing the transmission of the infection. Rotavirus vaccine trials are under way.