Cryptosporidiosis is a diarrheal disease caused by the *Cryptosporidium* parasite. It primarily affects the intestines of humans and various animals. It is a common cause of recreational water illness worldwide, particularly problematic for individuals with weakened immune systems.
No active Cryptosporidiosis reports in South Dakota right now.
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The *Cryptosporidium* parasite was first identified in mice in 1907, but it wasn't recognized as a human pathogen until the 1970s. It gained significant attention with the 1993 Milwaukee outbreak, the largest waterborne disease outbreak in US history. Its importance grew further as a common opportunistic infection in individuals with HIV/AIDS.
Cryptosporidiosis spreads through the fecal-oral route by ingesting oocysts, the infective form of the parasite. This commonly occurs through contaminated drinking or recreational water, as oocysts are highly resistant to chlorine. It can also spread through contaminated food or direct contact with infected people or animals.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
Our AI-powered surveillance continuously monitors Cryptosporidiosis activity across South Dakota. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
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For official state health alerts, vaccination locations, and public health guidance specific to South Dakota, visit your state health department's website.
Whether you live in South Dakota or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Trusted information from leading health organizations
Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-07-18
No confirmed cases reported in South Dakota yet. Here are the latest Cryptosporidiosis reports from our global surveillance network.
This event folder catalogues outbreaks of Cryptosporidiosis in USA. *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=8de40091-af03-4567-b5fc-bde2a78816e3)
This event envelope contains reports on cryptosporidiosis in Canada. *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=cb63d907-393b-42fa-a6e5-7a7f0cd1db83)
Cryptosporidiosis is an important cause of gastroenteritis in Australia, typically spread through contaminated water, food, and contact with infected people or animals. It has historically shown a seasonal pattern, with peaks in summer and, in some livestock-dense states, spring.…
This event envelope contains reports on cryptosporidiosis in Scotland. *Source: BEACON* - [View Full Report](https://beaconbio.org/en/event/?eventid=064a40c2-2042-46d5-9aaa-3040d9d9a709)
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