gastroenteritis. stomach flu or infectious diarrhea

stomach gastroenteritis flu infectious diarrhea closeup virion rotavirus cross disease medical illness pain ache problem stomachache medicine gastrointestinal infection inflammation digestion symptom patient sick sickness hurt abdomen indigestion unhealthy gastritis tract digestive discomfort belly gastro gastroenteric painful vomiting dehydration enteric viruses norovirus poisoning acute hygiene pathogens distress transmission epidemiology treatment vector