Wet waters and shorelines can be contaminated by bacteria such as leptospires or Whitmor's bacillus, by viruses (such as hepatitis A and E, for example) or by parasites. Travelers are infected by ingesting water or penetrating the skin of larvae.
In addition, the accumulation of water in the ear canal can be the cause of otitis externa: to prevent infections, avoid swimming in fresh water, especially when it is hot and stagnant (ponds, lakes, swamps). , Etc). Find out about the parasites that proliferate there, from a doctor if necessary. Do not put your head under water to reduce the risk of ingestion. Do not walk barefoot and never sit on the ground.