<unk> es in the alt=Many<unk>  particles packed together, which all look similar<unk> es are transmitted by the fæcal-oral route, via contact with contaminated hands, surfaces and objects, and possibly by the respiratory route. Viral diarrhoea is highly contagious. The faeces of an infected person can contain more than 10 trillion infectious particles per gram; fewer than 100 of these are required to transmit infection to another person.<unk> es are stable in the environment and have been found in estuary samples at levels up to 1–5 infectious particles per US gallon. The viruses survive between 9 and 19 days. Sanitary measures adequate for eliminating bacteria and parasites seem to be ineffective in control of<unk> , as the incidence of<unk>  infection in countries with high and low health standards is similar.
Rotavirus
Norovirus
Campylobacter jejuni
Yersinia enterocolitica
Salmonella
Giardia
Enterotoxigenic Escherichia coli
Shigella