India, May 17 -- Stomach upsets or "stomach flu," are common in summer season due to increased consumption of contaminated water and rapid bacterial and mould growth, causing food spoilage within two hours, and a higher incidence of gastroenteritis, food poisoning, diarrhoea, and vomiting. Dysentery is severe diarrhoea containing blood or mucus, often accompanied by intense stomach cramps, fever, and nausea. It is primarily caused by bacterial (Shigella) or parasitic (Entamoeba) infections. In addition to gastroenteritis, contaminated water can also cause diseases like cholera, typhoid, hepatitis, polio, and leptospirosis.

STOMACH UPSET (GASTROENTERITIS):

Causes include*Viral infections due to Norovirus (causes 50% of adult cases), rota...