Cryptosporidiosis

隐孢子虫病

Evidence-backed information EN 5/7 applicable sections · ZH 5/7 applicable sections Updated Oct 23, 2026

Cryptosporidiosis is an infection caused by the protozoan parasite Cryptosporidium and represents a major foodborne and waterborne health burden globally ^[1]^[2]. The parasite is responsible for over 8 million foodborne illness cases each year and is especially suited to foodborne transmission ^[1]. Molecular epidemiological tools have improved understanding of both zoonotic and anthroponotic transmission pathways ^[3]^[2]. Prevention relies on food safety management and hygiene interventions rather than therapeutic approaches ^[1].

Read the full clinical and epidemiological profile 6

Definition

Cryptosporidiosis is an infection by the protozoan parasite Cryptosporidium, which is a significant cause of diarrhoea worldwide and is associated with foodborne and waterborne disease outbreaks ^[4]^[2]. The genus comprises at least 44 recognized species and over 120 genotypes, with zoonotic and anthroponotic transmission cycles documented ^[2]^[3].

Clinical features

In children living in low-resource settings, cryptosporidiosis is associated with diarrhea, malnutrition, growth stunting, cognitive deficits, and oral vaccine failure ^[4]. Lower pathogenicity of some zoonotic species supports variation in clinical spectra among human populations ^[3].

Epidemiology

Cryptosporidium causes more than 8 million foodborne illness cases annually and imposes multibillion-dollar economic costs globally ^[1]. Developing and industrialized countries differ markedly in burdens from zoonotic species, with developing regions showing fewer human infections from C. parvum and limited zoonotic transmission of this species ^[3]. At least 44 Cryptosporidium species are now recognized, reflecting expanded detection over the last 50 years ^[2].

Transmission

The parasite is particularly suited to foodborne transmission, including via contaminated fresh produce, and is also transmitted through waterborne and zoonotic pathways ^[1]^[2]. Molecular studies confirm anthroponotic transmission of C. parvum subtypes shared by humans and cattle, alongside zoonotic routes ^[3].

Prevention

Implementation of food safety management tools such as Good Hygienic Practices, Hazard Analysis and Critical Control Points, and Quantitative Microbial Risk Assessment in industrialized nations is central to prevention ^[1]. In developing countries, Water, Sanitation, and Hygiene interventions are the primary preventive strategy ^[1].

References

1 Ryan U et al. Foodborne cryptosporidiosis. Int J Parasitol. 2018 Jan. PMID: 29122606. doi: 10.1016/j.ijpara.2017.09.004. PubMed: https://pubmed.ncbi.nlm.nih.gov/29122606/
2 Ryan UM et al. Taxonomy and molecular epidemiology of Cryptosporidium and Giardia - a 50 year perspective (1971-2021). Int J Parasitol. 2021 Dec. PMID: 34715087. doi: 10.1016/j.ijpara.2021.08.007. PubMed: https://pubmed.ncbi.nlm.nih.gov/34715087/
3 Xiao L et al. Zoonotic cryptosporidiosis. FEMS Immunol Med Microbiol. 2008 Apr. PMID: 18205803. doi: 10.1111/j.1574-695X.2008.00377.x. PubMed: https://pubmed.ncbi.nlm.nih.gov/18205803/
4 Love MS et al. Emerging treatment options for cryptosporidiosis. Curr Opin Infect Dis. 2021 Oct 1. PMID: 34261904. doi: 10.1097/QCO.0000000000000761. PubMed: https://pubmed.ncbi.nlm.nih.gov/34261904/
5 Adkins PRF et al. Cryptosporidiosis. Vet Clin North Am Food Anim Pract. 2022 Mar. PMID: 35219480. doi: 10.1016/j.cvfa.2021.11.009. PubMed: https://pubmed.ncbi.nlm.nih.gov/35219480/