Volume 43, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



We conducted a point prevalence survey for enteric protozoa in 205 institutionalized orphans 1–61 months of age in Bangkok, Thailand. was identified in 17 children (8%), in 42 (20%), and 3 children (1%) had both parasites. At the time of diagnosis, diarrheal symptoms were present in a minority of subjects: 36% of children with alone, 10% with alone, and in 20% of those with neither parasite. Although chronic nutritional status (height/age) was similar in all groups, acute nutritional status (weight/height) was lower only in children with ( score = -1.39 ± 0.13) compared with children with (mean score ± SEM = -0.56 ± 0.26) or neither parasite ( score = -0.78 ± 0.13; = 0.05). Detectable levels of -specific IgG antibodies by ELISA were identified in 15 of 16 Thai children with and in 17 of 19 Thai children without (mean OD ± SEM = 1.27 ± 0.18 vs. 1.06 ± 0.13, respectively), but in only 1 of 18 sera from toddlers in day-care centers in Denver, CO (OD = 0.128 ± 0.03). Although neither infection with nor was consistently associated with acute diarrheal symptoms, was more often associated with depressed acute nutritional status than . The high prevalence of specific antibodies to in Thai orphans suggests an association between high rates of exposure with asymptomatic excretion of the parasites.


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