Viral meningitis is caused by any of a number of different viruses, many of which are associated with other diseases. About half of the cases in the United States are caused by common intestinal viruses. Occasionally, children with mumps or herpes virus infection develop viral meningitis. Mosquito-borne viruses also cause some cases each year. In many cases, a specific virus cannot be identified.
Viral meningitis is found worldwide.
Cases that occur in summer and fall are usually caused by mosquito-borne viruses. Those occurring in winter are likely due to other diseases. Symptoms are fever, headache, stiff neck, and tiredness. Rash, sore throat, and vomiting can also occur. Symptoms generally appear within 1 week of exposure.