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Using the prevalence of individual species of intestinal nematode worms to estimate the combined prevalence of any species.

Abstract：

OBJECTIVES:To assess if a probabilistic model could be used to estimate the combined prevalence of infection with any species of intestinal nematode worm when only the separate prevalence of each species is reported, and to estimate the extent to which simply taking the highest individual species prevalence underestimates the combined prevalence. METHODS:Data were extracted from community surveys that reported both the proportion infected with individual species and the combined proportion infected, for a minimum sample of 100 individuals. The predicted combined proportion infected was calculated based on the assumption that the probability of infection with one species was independent of infection with another species, so the probability of combined infections was multiplicative. FINDINGS:Thirty-three reports describing 63 data sets from surveys conducted in 20 countries were identified. A strong correlation was found between the observed and predicted combined proportion infected (r = 0.996, P<0.001). When the observed and predicted values were plotted against each other, a small correction of the predicted combined prevalence by dividing by a factor of 1.06 achieved a near perfect correlation between the two sets of values. The difference between the single highest species prevalence and the observed combined prevalence was on average 7% or smaller at a prevalence of

journal_name

PLoS Negl Trop Dis

journal_title

PLoS neglected tropical diseases

authors

de Silva N,Hall A

doi

10.1371/journal.pntd.0000655

subject

Has Abstract

pub_date

2010-04-13 00:00:00

pages

e655

issue

4

eissn

1935-2727

issn

1935-2735

journal_volume

4

pub_type

杂志文章

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