Prevalence of infection, mean worm burden and degree of worn aggregation as determinants of prevalence of disease due to intestinal helminths
Arch. med. res
;
28(1): 121-7, mar. 1997. ilus
Artigo
em Inglês
| LILACS
| ID: lil-225206
RESUMO
Theoretical predictions of disease prevalence due to helminth infections based upon a simple probabilistica model which considers the infection prevalence, the mean worm urden and the degree of worm aggregation are presented. A numerical reappraisal of the likely estimates of the degree of aggregation based upon maximun likelihood estimates of the negative binomial distribution is presented. The prevalence of disease shows a positive relationship with the mean worm burden. This association is hyperbolic when helminth parasites are severely aggregated but is s-shaped when helminth parasites tend to be oversidpersed. The prevalence of disease decreases with the degree of worm aggregation whem the values of the mean intensity are low; as the mean intensity increases this association becomes positive. The relationship between prevalence of disease and prevalence of infection is hyperbolic for severe degrees of parasite aggregation and is s-shaped for intermediate degrees of aggregation. However, if the mean intesnsity is low and the degree of aggreation is high there could be a negative raltionship between the prevalence of disease due to helminth parasites is feasible for determined ranges of values of the infection prevalence, mena intensity and the degree of worm clumping
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Índice:
LILACS (Américas)
Assunto principal:
Helmintíase
/
Helmintos
/
Enteropatias Parasitárias
Tipo de estudo:
Estudo de prevalência
/
Estudo prognóstico
/
Fatores de risco
Limite:
Animais
/
Humanos
País/Região como assunto:
México
Idioma:
Inglês
Revista:
Arch. med. res
Assunto da revista:
Medicina
Ano de publicação:
1997
Tipo de documento:
Artigo
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