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PubMed1988

The evidence for predisposition to trichuriasis in humans: comparison of institutional and community studies.

This article compares the results of two studies of Trichuris trichiura infection, one conducted in a children's home and the other in a village. In both, the intensity of infection of a cohort of children was determined by antihelminthic expulsion initially, and again after a period of re-infection. The cohort of village children showed a predisposition to a particular intensity of infection. An individual with a heavy infection initially was likely to re-acquire a heavier than average worm burden. No such correlation was observed for the cohort of institutionalized children. It is suggested that the causation of predisposition is multifactorial, and that the contrasting results of the two studies may be due in part to differing levels of heterogeneity in exposure to infection, the village children being exposed to dissimilar domestic environments and the institutionalized children to only one.

Animals↗
PubMed1979

Hepatitis-B surface antigen and antibody: prevalence and persistence in institutionalized and noninstitutionalized persons.

A total of 426 persons were studied in an attempt to more clearly define the high prevalence of hepatitis-B surface antigen (HBsAg) seen among institutionalized persons. HBsAg was found in 63.4 percent of the children and young adults with Down's syndrome (DS) at the Central Wisconsin Center (CWC) and in 45.5 percent of those at the Northern Wisconsin Center (NWC). Significantly more subjects with DS had hepatitis-B antigenemia than age- and sex-matched non-DS institutionalized subjects. Antibody (anti-HBs) to HBsAg was found in 19.5 percent of the DS subjects at CWC and in 38.6 percent of those at NWC. The prevalence of anti-HBs was similar among DS and non-DS institutionalized subjects. None of the noninstitutionalized subjects had HBsAg in their serums and their anti-HBs prevalence was low (2.1 percent). HBsAg was found to persist for at least 10 years in both DS and non-DS institutionalized subjects. However, persistence occurred more frequently among DS subjects. Anti-HBs persisted at least 10 years among non-DS subjects, but DS subjects tended to lose antibody sooner. The study findings indicated that the high prevalence of HBsAg seen in institutionalized DS subjects at CWC and NWC were not related to the age of the subject at admission nor to the duration of institutionalization.

Adolescent↗