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Spore shedding pattern of Enterocytozoon bieneusi in asymptomatic children

^1,3Department of Parasitology¹ and Department of Military and Community Medicine³, Phramongkutklao College of Medicine, 315 Ratchawithi Rd, Ratchathewi, Bangkok 10400, Thailand ²Department of Protozoology, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand

Correspondence Mathirut Mungthin mathirut{at}pmk.ac.th

Received July 22, 2004
Accepted January 13, 2005

Stool samples from seven human immunodeficiency virus (HIV)-negative and two HIV-positive children with asymptomatic Enterocytozoon bieneusi infections were daily examined to quantify spore shedding using Gram-chromotrope staining under light microscopy. The spore shedding pattern and intensity in these children was variable. Mean spore concentrations in the stool samples from these children ranged from 2.4 x 10² to 1.2 x 10⁵ spores per gram. Light microscopy could detect spores in stool specimens for 9–33 days, while PCR was able to detect E. bieneusi in stool specimens for 3–40 days longer. This suggests that light microscopy may not detect low levels of spore shedding. Considering that the asymptomatic group are a potential source of infection, detection methods with a higher sensitivity should be used.

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