Cool, moist conditions favor organism's survival. Sudden onset of explosive watery stools, abdominal cramps, anorexia, nausea, and vomiting. Especially infects hikers, children, travelers, and institutionalized patients. Raw shellfish are especially susceptible, although cooking does not always kill the virus. After 3-10 days patient develops jaundice with darkened urine.
Severe cases can cause liver damage and death.
Nausea, vomiting, diarrhea, abdominal pain, headache, and low-grade fever. Lasts about 36 hours.