Meteorological Factors and Forecasts of Helminthic Disease

Ollerenshaw, C. B.; Smith, L.P.

doi:10.1016/s0065-308x(08)60437-6

Cited by 97 publications

(39 citation statements)

References 41 publications

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“…The significantly higher prevalences noted at Jijel may be explained by two hypotheses. The first would be to relate them to climatic conditions in the Jijel department (annual rainfall 750-900 mm), as there is a positive relationship between the prevalence of natural fasciolosis and the rainfall in a given district (Ollerenshaw and Smith 1969). The second hypothesis would be to explain these differences by the mode of anthelminthic treatment.…”

Section: Discussionmentioning

confidence: 99%

Preliminary studies on the prevalences of natural fasciolosis in cattle, sheep, and the host snail ( Galba truncatula ) in north-eastern Algeria

Mekroud

Benakhla²,

Vignoles

et al. 2004

Parasitology Research

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Three series of investigations on natural infections with Fasciola hepatica were carried out in north-eastern Algeria): (1) on different samples from cattle and sheep slaughtered at Constantine and Jijel from 1994 to 1996, (2) from 31 cattle- and sheep-breeding farms from 1999 to 2001, using serology on blood samples, and (3) on overwintering Galba truncatula from four populations, in 2002 and 2003. Significantly higher prevalences of fasciolosis were found in the cattle and sheep from Jijel (27.0% in slaughtered cattle and 27.3% in cattle from farms, compared to 9.1% and 6.3%, respectively, in cattle from Constantine). No significant differences in the prevalences were recorded between 1994 and 1996 and 1999 and 2001 for each species of ruminant, whatever the department considered. The infection rates for overwintering snails were also higher in the two populations from Jijel compared with those from the department of Constantine (a mean of 4.6-5.9% instead of 2.6-3.1%)). These results may be explained by the climatic conditions in the department of Jijel (an annual rainfall of 750-900 mm instead of 350 mm at Constantine), and the mode of anthelminthic treatment (the periods of treatment would be inappropriate in the case of Jijel).

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Section: Discussionmentioning

confidence: 99%

Preliminary studies on the prevalences of natural fasciolosis in cattle, sheep, and the host snail ( Galba truncatula ) in north-eastern Algeria

Mekroud

Benakhla²,

Vignoles

et al. 2004

Parasitology Research

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“…In this context, some climatic studies were carried out mainly in Europe (Ollerenshaw, 1959(Ollerenshaw, , 1971a(Ollerenshaw, ,b, 1973(Ollerenshaw, , 1974Ollerenshaw and Rowlands, 1959;Ollerenshaw and Smith, 1969;Ross, 1970Ross, , 1978Gettinby et al, 1974;Leimbacher, 1978), in the southern states of the USA (Malone et al, 1987;Malone and Zukowski, 1992) and in the east of Africa Yilma and Malone, 1998). Various climatic forecast indices were developed with the aim to predict the animal fasciolosis transmission risk: the Stormont 'wet day' index (Ross, 1970) and the temperature model (Gettinby et al, 1974), both being rather limited as they are based on one climatic factor only; and the more complete and more frequently used, Mt index (Ollerenshaw and Rowlands, 1959) and the Water-budget-based system (Wb-bs) index (Malone et al, 1987).…”

Section: Climatic Forecast Indicesmentioning

confidence: 99%

Remote sensing and climate data as a key for understanding fasciolosis transmission in the Andes: review and update of an ongoing interdisciplinary project

Fuentes

2006

Geospat Health

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Abstract. Fasciolosis caused by Fasciola hepatica in various SouthAmerican countries located on the slopes of the Andes has been recognized as an important public health problem. However, the importance of this zoonotic hepatic parasite was neglected until the last decade. Countries such as Peru and Bolivia are considered to be hyperendemic areas for human and animal fasciolosis, and other countries such as Chile, Ecuador, Colombia and Venezuela are also affected. At the beginning of the 1990s a multidisciplinary project was launched with the aim to shed light on the problems related to this parasitic disease in the Northern Bolivian Altiplano. A few years later, a geographic information system (GIS) was incorporated into this multidisciplinary project analysing the epidemiology of human and animal fasciolosis in this South American Andean region. Various GIS projects were developed in some Andean regions using climatic data, climatic forecast indices and remote sensing data.Step by step, all these GIS projects concerning the forecast of the fasciolosis transmission risk in the Andean mountain range were revised and in some cases updated taking into account new data. The first of these projects was developed on a regional scale for the central Chilean regions and the proposed model was validated on a local scale in the Northern Bolivian Altiplano. This validated mixed model, based on both fasciolosis climatic forecast indices and normalized difference vegetation index values from Advanced Very High Resolution Radiometer satellite sensor, was extrapolated to other human and/or animal endemic areas of Peru and Ecuador. The resulting fasciolosis risk maps make it possible to show the known human endemic areas of, mainly, the Peruvian Altiplano, Cajamarca and Mantaro Peruvian valleys, and some valleys of the Ecuadorian Cotopaxi province. Nevertheless, more climate and remote sensing data, as well as more accurate epidemiological reports, have to be incorporated into these GIS projects, which should be considered the key in understanding fasciolosis transmission in the Andes.

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“…Several investigations on the ecology of nematode larvae in temperate areas have focused on seasonal variation in the availability of GIT nematode larvae on the pasture of domestic herbivores (Brunsdon, 1970;Donald et al, 1978;Evans, 1974;Gibbs, 1967;Ollerenshaw & Smith, 1969;Southcott et al, 1976), or on the effect of vegetation height on pasture contamination (Angus, 1978;Gibson, 1966). Moreover, a number of studies have concentrated on the climatic (seasonal) variation in pasture contamination in tropical ecosystems carrying pure domestic stocks (Banks et al, 1990;Bekele et al, 1992;Cheijina & Fakae, 1984;Chartier, 1991;Dinnik & Dinnik, 1961;Kabasa, 1999;Onyali et al, 1990), or a mixed cattle/game stocking (Ocaido, 1995).…”

Section: Discussionmentioning

confidence: 99%

Foraging height levels and the risk of gastro-intestinal tract parasitic infections of wild ungulates in an African savannah eco-system

Apio

Plath²,

Wronski³

2006

Helminthologia

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SummaryGrazing herbivores mainly feed at low feeding height levels, while browsers select food items above ground level. Previous studies on gastrointestinal tract (GIT) nematode parasite burdens of African ungulates have suggested that browsing species hereby minimise the risk of infection with parasites. Here, we investigated the influence of feeding height levels on the pasture larval contamination level (PCL) in a natural African savannah eco-system in Queen Elizabeth National Park, western Uganda. The prevalence and mean abundance of infectious GIT nematode larvae on the pasture were used as measures of pasture contamination. Vegetation samples were examined following standard larval isolation, concentration and counting techniques. We found the feeding height level to be significantly related to the occurrence of infectious GIT nematode larvae, and the contamination was highest at low feeding levels. There was no statistically significant seasonal variation in the prevalence or mean abundance of the contamination of pastures with nematode larvae.

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Meteorological Factors and Forecasts of Helminthic Disease

Cited by 97 publications

References 41 publications

Preliminary studies on the prevalences of natural fasciolosis in cattle, sheep, and the host snail ( Galba truncatula ) in north-eastern Algeria

Preliminary studies on the prevalences of natural fasciolosis in cattle, sheep, and the host snail ( Galba truncatula ) in north-eastern Algeria

Remote sensing and climate data as a key for understanding fasciolosis transmission in the Andes: review and update of an ongoing interdisciplinary project

Foraging height levels and the risk of gastro-intestinal tract parasitic infections of wild ungulates in an African savannah eco-system

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