B
Balantidium coli
Balantidium coli (also referred to as B. coli or Balantioides coli) Balantidium coli Details: Type:Protozoan parasite (single-celled organism) Category:Intestinal protozoa Transmission Type:Fecal‑oral Primary Target Area:Large intestine (colon and cecum) Lifecycle Form:Exists in two forms — cyst (infective form) and trophozoite (active form inside the host) Incubation Period:Symptoms, when present, usually develop within a few days ... Read more
D
Dientamoeba fragilis
Dientamoeba fragilis (also referred to as D. fragilis) Dientamoeba fragilis Details: Type:Protozoan parasite (single-celled organism) Category:Intestinal protozoa Transmission Type:Waterborne and foodborne parasite Primary Target Area:Large intestine Lifecycle Form:Exists mainly as a trophozoite (active form) inside the intestines; a cyst form may exist, but is not fully established. Incubation Period:Symptoms, when present, typically develop within 1–3 ... Read more
C
Cyclospora cayetanensis
Cyclospora cayetanensis (also known simply as Cyclospora) Cyclospora cayetanensis Details: Type:Protozoan parasite (single-celled organism) Category:Intestinal protozoa Transmission Type:Waterborne and foodborne parasite Primary Target Area:Small intestine Lifecycle Form:Exists in two forms — unsporulated oocyst (non-infectious when passed in stool) and sporulated oocyst (infectious form after environmental maturation) Incubation Period:Symptoms typically appear about 1 week after exposure, ... Read more
Cryptosporidium Hominis
Cryptosporidium hominis (also known as C. hominis) Cryptosporidium hominis Details: Type:Protozoan parasite (single-celled organism) Category:Intestinal protozoa Transmission Type:Waterborne and foodborne parasite Primary Target Area:Small intestine Lifecycle Form:Exists in two forms — oocyst (infectious form) and sporozoite (active form) Incubation Period:Symptoms typically appear 2–10 days after exposure, though timing can vary. Transmission:Cryptosporidium hominis spreads through ingestion ... Read more
Cryptosporidium (Cryptosporidium parvum)
What Is Cryptosporidium? Cryptosporidium (often shortened to “crypto”) is a microscopic, single-celled parasite that infects the intestines and causes a diarrheal illness called cryptosporidiosis. It spreads mainly through contaminated water and is notable for being extremely resistant to chlorine, which makes pools and water parks a common source of outbreaks. Classification: Protozoa (Single-Celled) › Cryptosporidium ... Read more
B
Blastocystis hominis
Blastocystis hominis (also known as Blastocystis spp.) Blastocystis hominis Details: Type:Protozoan parasite (single-celled organism) Category:Intestinal protozoa Transmission Type:Fecal-oral parasite (waterborne and foodborne) Primary Target Area:Large intestine Lifecycle Form:Exists in two forms — vacuolar form (active form) and cyst (infectious form) Incubation Period:Symptoms typically appear 1–2 weeks after exposure, though many individuals remain asymptomatic. Transmission:Blastocystis hominis ... Read more
E
Entamoeba histolytica
Entamoeba histolytica (also known as E. histolytica) Entamoeba histolytica Details: Type:Protozoan parasite (single-celled organism) Category:Intestinal protozoa Transmission Type:Fecal-oral parasite (waterborne and foodborne) Primary Target Area:Large intestine Lifecycle Form:Exists in two forms — trophozoite (active form) and cyst (infectious form) Incubation Period:Symptoms typically appear 2–4 weeks after exposure, though timing can vary. Transmission:Entamoeba histolytica spreads through ... Read more
G
Giardia (Giardia lamblia)
What Is Giardia? Giardia is a microscopic, single-celled parasite that infects the small intestine and causes a gut illness called giardiasis. According to the CDC, it is one of the most common intestinal parasites in the United States. Most people pick it up by swallowing water, food, or surfaces that have been in contact with ... Read more
Frequently Asked Questions
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