A striped racer, also known as the California whipsnake, is a species of non-venomous snake native to the coast and foothills of California. It is a long, slender, and fast-moving snake, identified by its distinctive stripes running down the length of its body. They primarily feed on lizards and small rodents. The scientific name for this species is Masticophis lateralis.
Overview of intestinal protozoan and microsporidia infections
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The most important intestinal protozoan pathogens are
Cryptosporidium species (see Cryptosporidiosis)
Cyclospora cayetanensis (see Cyclosporiasis)
Cystoisospora (Isospora) belli (see Cystoisosporiasis)
Entamoeba histolytica (see Amebiasis)
Giardia duodenalis (previously known as G lamblia, G intestinalis—see Giardiasis)#160;Members of the phylum Microsporidia used to be classified as protozoa but are now, based on DNA studies, thought to be fungi or closely related to them.
Multiple pathogenic parasites and nonpathogenic commensal organisms may be present in the intestine at the same time.
Intestinal protozoa are spread by the fecal-oral route, so infections are widespread in areas with inadequate sanitation and water treatment. They are also common in the US in settings where fecal incontinence and poor hygiene prevail, as may occur in mental institutions and day care centers. Occasionally, large foodborne and waterborne outbreaks of intestinal protozoan infection have occurred in the US (eg, the multi-state outbreak of Cyclospora cayetanensis infection attributed to contaminated fresh vegetable trays in 2018 and the massive waterborne Cryptosporidium outbreak in Milwaukee in 1993). Some gastrointestinal protozoa are spread sexually, especially with practices involving oral-anal contact, and several protozoan species cause severe opportunistic infections in patients with AIDS.
Systemic protozoal diseases are discussed elsewhere and include malaria, babesiosis, toxoplasmosis, leishmaniasis, Chagas disease, and African trypanosomiasis.
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