Microgeographical patterns of schistosomiasis and water contact behavior; examples from Africa and Brazil

Kloos, Helmut; Gazzinelli, Andréa; Zuyle, Paul Van

doi:10.1590/s0074-02761998000700006

Cited by 62 publications

(59 citation statements)

References 17 publications

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“…Similar results were reported by Etard & Borel (1992) for Schistosoma haematobium in a Mauritanean village, where domestic contacts, mostly by females, represented 62% of all observations. Kloos et al (1998) noted the importance of the household in determining water contact activities for Schistosoma mansoni in Brazil due to the greater privatization of water resources.…”

Section: Discussionmentioning

confidence: 99%

Exposure to Schistosoma mansoni infection in a rural area in Brazil. II: Household risk factors

Bethony

Williams

Kloos

et al. 2001

Tropical Med Int Health

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SummaryA number of studies have pointed out the potential importance of the household in the transmission of schistosomiasis. The clustering of domestic activities associated with water collection, storage, and usage can result in the sharing of transmission sites and infective water contact behaviours. In this study, we employed a variance component method to estimate effects due to individual risk factors and shared residence on the variance in faecal egg counts during Schistosoma mansoni infection. A suite of covariates, which included demographic, socioeconomic, water supply, and water contact behaviour terms, contributed 15% to the variance in faecal egg counts. Shared residence alone accounted for 28% of the variance in faecal egg excretion. When both the suite of covariates and shared residence were considered in the same model, shared residence still contributed 22% to the variance in infection intensity. These results point to the importance of shared residence as a means of capturing the complex interrelationship between shared demographic, socioeconomic, physical environmental, and behavioural factors that in¯uence transmission of schistosomiasis at the household level.keywords Schistosoma mansoni, epidemiology, variance component methods, household, Brazil

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Section: Discussionmentioning

confidence: 99%

Exposure to Schistosoma mansoni infection in a rural area in Brazil. II: Household risk factors

Bethony

Williams

Kloos

et al. 2001

Tropical Med Int Health

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“…9 Previous studies have pointed to the importance of shared residence in the distribution of helminthic infections. [10][11][12] The clustering of domestic activities associated with water collection, storage, and usage can lead to the sharing of infective sites and infective water contact behaviors, exposing household members to similar risks of infection. 13 In our previous study, 7 we determined that shared residence accounted for 28% of the variance in fecal egg counts.…”

Section: Introductionmentioning

confidence: 99%

Additive host genetic factors influence fecal egg excretion rates during Schistosoma mansoni infection in a rural area in Brazil.

Bethony¹,

Williams²,

Blangero³

et al. 2002

The American Journal of Tropical Medicine and Hygiene

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Abstract. This study quantifies the influence of shared household and kinship on egg counts during Schistosoma mansoni infection in a sample from rural Brazil. Detailed genealogic information allowed assignment of 597 individuals to 6 multihousehold pedigrees residing in 145 households. A variance component method was used to partition egg counts into shared household, additive genetic, and individual-specific environmental effects. Host additive genetic effects consistently accounted for a large proportion of the variation in egg counts: 43% in an unadjusted model and 40% in model adjusted for covariates. In a model that examined the confounding of shared household with kinship, additive genetic effects still accounted for 27% of the variation in egg counts and shared household only 12%. The consistently important role for host additive genetic factors on the variation in egg counts points to new ways of modeling and understanding the mechanisms that contribute to trait variation during infection with S. mansoni.

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“…Daily circulation involves leaving a place of residence for a period up to 24 h. A number of epidemiological studies of schistosomiasis in Brazil and Africa have reported daily circulation movements by housewives, farmers, people visiting relatives and students attending school, among others (Ruyssenaars et al 1973, Lima e Costa et al 1987, 1998, Gazzinelli & Kloos 2007, Kloos et al 2008. Perhaps the most common daily movements in rural areas are trips to household water sites at streams and other potential transmission sites; the patterns and epidemiological risks of these movements have been identified and spatially analysed in a number of studies (Kloos et al 1998, Friedman et al 2001. Daily movements of farmers to the fields may be similarly important epidemiologically because many farmers wash or bathe in streams near their homes on their return trips .…”

Section: A Typology Of Population Movementsmentioning

confidence: 99%

The role of population movement in the epidemiology and control of schistosomiasis in Brazil: a preliminary typology of population movement

Kloos¹,

Correa-Oliveira

Reis

et al. 2010

Mem. Inst. Oswaldo Cruz

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Microgeographical patterns of schistosomiasis and water contact behavior; examples from Africa and Brazil

Cited by 62 publications

References 17 publications

Exposure to Schistosoma mansoni infection in a rural area in Brazil. II: Household risk factors

Exposure to Schistosoma mansoni infection in a rural area in Brazil. II: Household risk factors

Additive host genetic factors influence fecal egg excretion rates during Schistosoma mansoni infection in a rural area in Brazil.

The role of population movement in the epidemiology and control of schistosomiasis in Brazil: a preliminary typology of population movement

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