Survival ofBulinus africanus(Krauss),Bulinus globosus(Morelet) andBiomphalaria pfeifferi(Krauss) at constant high temperatures

Joubert, P. H.; Pretorius, S. J.; Kock, K. N. de; Eeden, J. A. Van

doi:10.1080/02541858.1986.11447963

Cited by 22 publications

(23 citation statements)

References 8 publications

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“…1988) and 1800 m in Kenya (Diesfeld 1969). At these altitudes, low temperatures (<16 °C) cause snails to die before the cercariae mature from sporocysts, limiting transmission (Pflüger 1980; Joubert et al. 1986).…”

Section: Discussionmentioning

confidence: 99%

Epidemiology and geography of Schistosoma mansoni in Uganda: implications for planning control

Kabatereine

Brooker

Tukahebwa

et al. 2004

Tropical Med Int Health

211

196

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SummaryIntestinal schistosomiasis caused by infection with Schistosoma mansoni is a widespread public health problem in Uganda. Although long known to be endemic, its current distribution within the country requires updating of parasitological data to help guide planned control. We report such data collected between 1998 and 2002 from 201 schools and 68 communities across Uganda. In accordance with epidemiological expectation, prevalence and intensity increased with age, peaking at 10-20 years and thereafter declined moderately with age, whereas intensity declined more rapidly with age, and the prevalence of infection in a school was non-linearly related to the mean intensity of infection. We used geographical information systems to map the distribution of infection and to overlay parasitological data with interpolated environmental surfaces. The derived maps indicate both a widespread occurrence of infection and a marked variability in infection prevalence, with prevalence typically highest near the lakeshore and along large rivers. No transmission occurred at altitudes >1400 m or where total annual rainfall was <900 mm; limits which can help estimate the population at risk of schistosomiasis. The results are discussed in reference to the ecology of infection and provide an epidemiological framework for the design and implementation of control efforts underway in Uganda.

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Section: Discussionmentioning

confidence: 99%

Epidemiology and geography of Schistosoma mansoni in Uganda: implications for planning control

Kabatereine

Brooker

Tukahebwa

et al. 2004

Tropical Med Int Health

211

196

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“…Earlier studies [8–10] observed that B. globosus , the intermediate host snail of S. haematobium , had high thermal tolerance and adapted in areas with fluctuating temperature [11, 12]. This snail has also been observed to have marked increase in survival time at temperatures as high as 34.0 °C [6] while its optimal temperature for fecundity and growth has been shown to be 25.0 °C [11]. Furthermore, this temperature coincides with the optimal temperature range (22 – 27 °C) for disease transmission [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on the Bulinus globosus — Schistosoma haematobium system

2017

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BackgroundGiven that increase in temperature may alter host-parasite relationships, the anticipated rise in temperature due to global warming might change transmission patterns of certain diseases. However, the extent to which this will happen is not well understood.MethodsUsing a host-parasite system involving Bulinus globosus and Schistosoma haematobium, we assessed the effect of temperature on snail fecundity, growth, survival and parasite development under laboratory conditions.ResultsOur results show that temperature may have a non-linear effect on snail fecundity and snail growth. Snails maintained at 15.5 °C and 36.0 °C did not produce egg masses while those maintained at 25.8 °C laid 344 and 105 more egg masses than snails at 31.0 °C and 21.2 °C, respectively. Attainment of patency led to a reduction in egg mass production among the snails. However, the reduction in fecundity for snails maintained at 21.2 °C occurred before snails started shedding cercariae. Parasite development was accelerated at high temperatures with snails maintained at 31.0 °C reaching patency after three weeks. Furthermore, snail growth rate was highest at 25.8 °C while it was inhibited at 15.5 °C and reduced at 31.0 °C. Increase in temperature increased snail mortality rates. Snails maintained at 36.0 °C had the shortest survival time while those maintained at 15.5 °C had the longest survival time.ConclusionsWe concluded that temperature influences fecunxdity, growth, survival and parasite development in the snail and thus dictates the time it takes the parasite to complete the life cycle. This has implications on transmission of schistosomiasis in the context of global warming.Electronic supplementary materialThe online version of this article (doi:10.1186/s40249-017-0260-z) contains supplementary material, which is available to authorized users.

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“…These optimal temperature regime maps were then combined to produce one final temperature mask for each parasite species. The temperature regime used to create the S. mansoni temperature mask were 16-35ºC with a developmental null point of 14.2ºC (Pflüger, 1980, Joubert et al, 1986. A temperature regime of 18-32ºC and a developmental null point of 15.3ºC were used to mask out areas unsuitable for S. haematobium transmission (Pflüger et al, 1984).…”

Section: Deriving Transmission Suitability Maps Based On Temperature mentioning

confidence: 99%

Modeling freshwater snail habitat suitability and areas of potential snail-borne disease transmission in Uganda

Stensgaard

Jørgensen²,

Kabatereine

et al. 2006

Geospat Health

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Abstract. Geographic information system (GIS)-based modeling of an intermediate host snail species' environmental requirements using known occurrence records can provide estimates of its spatial distribution. When other data are lacking, this can be used as a rough spatial prediction of potential snail-borne disease transmission areas. Furthermore, knowledge of abiotic factors affecting intra-molluscan parasitic development can be used to make "masks" based on remotely sensed climatic data, and these can in turn be used to refine these predictions. We used data from a recent freshwater snail survey from Uganda, environmental data and the genetic algorithm for rule-set prediction (GARP) to map the potential distribution of snail species known to act as intermediate hosts of several human and animal parasites. The results suggest that large areas of Uganda are suitable habitats for many of these snail species, indicating a large potential for disease transmission. The lack of parasitological data still makes it difficult to determine the magnitude of actual disease transmission, but the predicted snail distributions might be used as indicators of potential present and future risk areas. Some of the predicted snail distribution maps were furthermore combined with temperature masks delineating suitable temperature regimes of the parasites they host. This revealed the coinciding suitable areas for snail and parasite, but also areas suitable for host snails, but apparently not for the parasites. Assuming that the developed models correctly reflect areas suitable for transmission, the applied approach could prove useful for targeting control interventions.

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Survival ofBulinus africanus(Krauss),Bulinus globosus(Morelet) andBiomphalaria pfeifferi(Krauss) at constant high temperatures

Cited by 22 publications

References 8 publications

Epidemiology and geography of Schistosoma mansoni in Uganda: implications for planning control

Epidemiology and geography of Schistosoma mansoni in Uganda: implications for planning control

Effect of temperature on the Bulinus globosus — Schistosoma haematobium system

Modeling freshwater snail habitat suitability and areas of potential snail-borne disease transmission in Uganda

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