The most common symptoms of rotavirus are severe watery diarrhea, vomiting, fever, and/or abdominal pain.

Rotavirus is a genus of double-stranded RNA viruses in the family Reoviridae. Rotaviruses are the most common cause of diarrhoeal disease among infants and young children. Nearly every child in the world is infected with a rotavirus at least once by the age of five.Symptoms usually start about 2 days after a person is exposed to rotavirus. Vomiting and watery diarrhea can last 3 to 8 days. Additional symptoms may include loss of appetite and dehydration (loss of body fluids), which can be especially dangerous for infants and young children.

Symptoms of dehydration include:

• decreased urination
• dry mouth and throat
• feeling dizzy when standing up
• crying with few or no tears and
• unusual sleepiness or fussiness.