Nearly all children are infected at least once before the age of 2 years, and repeat infections are common. It spreads from person to person especially if the personal hygiene is not good. In tropical areas, rotavirus diarrhea occurs throughout the year . However it is more frequent during the winter months. Bacteria such as shigella, salmonella, vibrio cholera also cause diarrhea.
Cholera occurs in epidemics.
Bacterial diarrheas peak is more common during the the rainy season. Enterotoxigenic coli called ETT is an important cause of diarrhea. The diarrhea is mainly watery. Parasitis such as amoebiasis and giardiasis also can cause diarrhea, although not so commonly. Diarrhea is seen when the an infant is teething.