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Questionable clinical significance of Blastocystis hominis infection
1Department of Laboratories, North Shore University Hospital, Manhasset, New York.
Abstract:
In the period from January 1986 to July 1988, Blastocystic hominis was found in moderate and numerous quantities in 103 (1.6%) of 6,262 stool specimens examined in our laboratory. There was no significant association of the detection of B. hominis with travel history or symptoms. Indeed, 20 patients (36%) with moderate to heavy infections had no gastrointestinal symptoms, and three symptomatic patients did not show clinical improvement after elimination of the parasite. Reexamination of stool samples revealed that eight untreated patients had spontaneous disappearance of B. hominis. We conclude that B. hominis probably is not responsible for clinical symptoms when detected, and additional investigations should be pursued for other etiologies of the patient's symptoms.
Insights
Blastocystic hominis (B. hominis) was detected in 1.6% of stool samples, with no clear link to symptoms or travel. This parasite is likely not a cause of gastrointestinal illness.
Area of Science:
- Medical Parasitology
- Clinical Microbiology
- Gastroenterology
Background:
- Blastocystis hominis (B. hominis) is a common intestinal protozoan parasite.
- Its clinical significance in causing gastrointestinal symptoms remains debated.
- Understanding B. hominis prevalence and pathogenicity is crucial for accurate diagnosis.
Observation:
- B. hominis was identified in 1.6% of 6,262 stool specimens examined between January 1986 and July 1988.
- No significant association was found between B. hominis detection and patient travel history or reported symptoms.
- A notable proportion of infected patients (36%) were asymptomatic, and some symptomatic individuals did not improve after parasite elimination.
Findings:
- The study found no correlation between B. hominis and gastrointestinal symptoms.
- Spontaneous clearance of B. hominis occurred in some untreated patients.
- These findings suggest B. hominis may be a commensal organism rather than a primary pathogen.
Implications:
- B. hominis detection alone should not be considered indicative of a causative agent for gastrointestinal distress.
- Further investigations are necessary to identify the true etiology of symptoms in patients with B. hominis.
- This research impacts diagnostic approaches and treatment decisions for parasitic infections.