"Cryptosporidium-treated treated water-associated outbreaks at leisure lead to seasonal highs for both Cryptosporidiosis outbreaks in summer and total Cryptosporidiosis outbreaks." on a statement by the US Centers for the Control and Prevention of Diseases.
Although almost never deadly, a death has been reported since 2009, according to the CDC. According to the CDC, a further 287 people were hospitalized between 2009 and 201
- Between 2009 and 2017, 444 outbreaks of cryptosporidiosis were reported in 40 states and in Puerto Rico.
- The outbreaks led to 7,465 people becoming ill.
- Leisure water – mainly swimming pools, but also children's pools and water playgrounds – was responsible for more than a third of the cases in 156 cases.
- Untreated water (like lakes) and drinking water caused 22 more cases.
- Eighty-six cases involved contact with animals, mainly cattle.
- Another 57 cases related to childcare settings.
- Twenty-two cases were food-related and mostly concerned unpasteurised milk or cider.
- Most cases were reported in July and August, and 2016 was a peak year with more than 80 cases.
- The number of cases increased between 2009 and 2017 by an average of 12.8% annually.
The CDC adds two caveats to the numbers that it suspects to underestimate the number of actual cases and outbreaks: The increase in cases may be the result of new testing technologies as well as the requirements and ability to Detection and investigation Cases and messages vary according to jurisdiction.
It is also noteworthy that the only case in which the parasite was transmitted in a hospital was death from cryptosporidiosis.
In basins, Cryptosporidium can invade the body when a swimmer ingests contaminated water.
The parasite is a problem in swimming pools, as an infected swimmer may excrete the parasite several orders of magnitude above the amount required to cause the infection. Cryptosporidium has high tolerance to chlorine and can survive up to seven days in a properly chlorinated pool, according to CDC.
There are preventive measures that can help contain the number of outbreaks, and the CDC is working to educate the public.
Diarrhea sufferers should not be instructed in childcare, according to the CDC. After an outbreak of cryptosporidiosis, caregivers should clean the surfaces with hydrogen peroxide, since chlorine bleach is an ineffective means of killing the parasite.
Persons in contact with livestock should wash their hands thoroughly and remove their shoes or clothing to avoid contamination of other environments, such as their homes.
For swimming pools, anyone suffering from diarrhea should avoid swimming at least two weeks later. According to CDC, their diarrhea subsides.