But the worst example of congestion by people is at the Gorai bridge where the lake has been filled with faeces and rubbish and is a popular squatting ground.
Germs (potentially infectious bacteria, viruses etc.) are constantly shed from these sources via mucous membranes, faeces, vomit, skin scales, etc.
An intermediate step is often involved, such as drinking water contaminated by faeces or food prepared by workers who fail to practice adequate hand-washing, and is more common in regions where untreated sewage is common.
Male menstruation is a term occasionally unofficially used for a type of bleeding in the urine or faeces, reported in some tropical countries.