Hydric pathogen microorganismes present in water can be divised in three parts : virus, bacteria and protozoa. Virus and bacteria grow in surface water and underground water, whereas protozoa grow mainly in surface water.



Cryptosporidium is a parasite protected by an outer shell that allows it to survive outside the body for long periods of time. This parasite can be spread in several ways but the most common is by water not treated. It is a leading cause of waterborne disease in the United States. In the United States, an estimated 748,000 cases of cryptosporidiosis occur each year. The cryptosporidium grows in human or animal digestive system and respiratory tract. It leads to a disease call “Cryptosporidiosis“.

It develops well in optimal temperature. This parasite is inactive around -22°C or 65°C. Some virus and bacteria don’t resist to desinfection, but the cryptosporidium resist to desinfection e.g chlorine.



The cryptosporidium infectious stage is called “oocyst”. The oocyst is a shell, which protects 4 individuals parasites. After ingestion of this oocyst, the shell opens and release parasites.

Cryptosporidium can be spread by :

  • Eating uncooked food contaminated with crypto.
  • Touching your mouth with contaminated hands
  • Drink contaminated water


Symptoms and treatment

Once infected, people with decreased immunity are most at risk for severe disease. The risk of developing severe disease may differ depending on each person’s degree of immune suppression.

Symptoms appear two or ten days after the infection. Symptoms are fever, nausea, abdominal cramps. To treat this infection, people have to rest, drink a lot and have a good hygiene.

At least 32 outbreaks caused by Cryptosporidium linked to swimming pools or water playgrounds in the United States were reported in 2016, compared with 16 outbreaks in 2014,

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