Balantidiasis

Balantidiasis (also known as balantidial dysentery) is an infectious disease caused by the ciliated protozoan parasite Balantidium coli (now reclassified as Neobalantidium coli or Balantioides coli), the largest protozoan known to infect humans. This is not a genetic disorder but rather a parasitic zoonotic infection. It primarily affects the gastrointestinal system, particularly the large intestine (colon), where the organism invades the mucosal lining and can cause ulcerations similar to those seen in amoebiasis. Pigs are the most common reservoir host, and transmission occurs through the fecal-oral route, typically via ingestion of contaminated water or food. Clinical manifestations range from asymptomatic carriage to severe dysentery. Symptomatic patients may experience chronic diarrhea, dysentery with bloody or mucoid stools, abdominal pain, nausea, vomiting, weight loss, and tenesmus. In severe cases, colonic perforation, peritonitis, and extraintestinal spread (rarely to the liver, lungs, or genitourinary tract) can occur, which may be life-threatening. Immunocompromised individuals, malnourished persons, and those living in close contact with pigs or in areas with poor sanitation are at greatest risk. Treatment is generally effective with antiparasitic medications. Tetracycline is considered the drug of choice, with metronidazole and iodoquinol serving as alternative therapies. Supportive care including rehydration may be necessary in cases of severe diarrhea. Prevention focuses on improved sanitation, safe water practices, and hygiene measures, particularly in communities with pig farming. The prognosis is generally good with appropriate treatment, though untreated severe cases can be fatal.

Common questions about Balantidiasis