Observations on the field transmission dynamics of <i>Schistosoma mansoni</i> and <i>S. mattheei</i> in southern Natal, South Africa

Donnelly, F.A.; Appleton, C.C.

doi:10.1017/s0031182000057371

Cited by 17 publications

(9 citation statements)

References 18 publications

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“…However, as stated by Donnelly and Appleton (1985), it is unlikely to be a limiting factor in areas like that of the present study, where there is only a moderate density of aquatic vegetation.…”

Section: Discussionmentioning

confidence: 89%

Evaluation of Chemical and Physical-morphological Factors as Potential Determinants of Biomphalaria pfeifferi (Krauss, 1848) Distribution

Utzinger¹,

Mayombana²,

Mez³

et al. 1997

Mem. Inst. Oswaldo Cruz

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Section: Discussionmentioning

confidence: 89%

Evaluation of Chemical and Physical-morphological Factors as Potential Determinants of Biomphalaria pfeifferi (Krauss, 1848) Distribution

Utzinger¹,

Mayombana²,

Mez³

et al. 1997

Mem. Inst. Oswaldo Cruz

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“…Respiration by dense algal blooms at night can also lead to intermittent oxygen depletion. Dissolved oxygen concentrations below 2.5 mg L −1 have adverse effects on freshwater fauna (Donnelly and Appleton, 1985). Pulmonate snails are better adapted to a temporary oxygen shortage than caenogastropods (Brown, 1994).…”

Section: Discussionmentioning

confidence: 99%

Modern and early Holocene mollusc fauna of the Ounianga lakes (northern Chad): implications for the palaeohydrology of the central Sahara

Bocxlaer

Verschuren

Schettler

et al. 2011

J Quaternary Science

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The fresh and saline lakes of Ounianga Kebir and Serir in northeastern Chad are among the very few permanent aquatic ecosystems currently existing in the hyper-arid core of the Sahara desert. The confirmed modern fauna of aquatic molluscs at Ounianga comprises three widespread species (Melanoides tuberculata, Biomphalaria pfeifferi and Lymnaea natalensis), of which only the first appears to maintain a thriving population. We recovered seven more species of gastropods, among which one is new to science (Gabbiella ouniangaensis), and one bivalve species from early Holocene outcrops of diatomaceous limestone at Ounianga Serir. All species except one are known to be commonly spread between lake and river systems by birds, and in its entirety this species-rich fossil mollusc fauna of Ounianga Serir resembles that of other Saharan lake sites known to have been hydrologically isolated during the early Holocene. The impoverished modern mollusc fauna, which lacks even the widespread and opportunistic species Bulinus truncatus, may have become established relatively recently through new colonisation events, following eradication of the early Holocene mollusc fauna during a later episode of high salinity or desiccation.

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“…in Guadeloupe (0.2–5.0% of B. glabrata with S. mansoni ; Sire et al . 1999) or in South Africa (0.6–10.4% of B. pfeifferi with S. mansoni ; Donnelly & Appleton 1985). However, the total prevalence of infected snails in the three active transmission sites in Dhofar Governorate (Siginitti, Tibraq and Arazat) (45 of 4683, 0.96%) was significantly different from that found in Guadeloupe (43 of 6972, 0.62%; χ 2 = 3.98, P = 0.046) and from that found in South Africa (62 of 3062, 2.02%; χ 2 = 14.61, P = 0.0001).…”

Section: Discussionmentioning

confidence: 99%

Ecological and molecular studies on emerging schistosomiasis mansoni in Dhofar Governorate, Sultanate of Oman

Moné

Mouahid

Shaban

et al. 2003

Tropical Med Int Health

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Summary The recent detection of some cases of autochtonous schistosomiasis mansoni in Dhofar, Oman, prompted a search for the transmission sites. The five field surveys we conducted from November 2000 to February 2002 provided ecological data on schistosomiasis in Dhofar. Twenty‐eight water bodies situated within 8–160 km from Salalah, the largest city of Dhofar and at altitudes of up to 900 m, were surveyed for freshwater snails. Biomphalaria arabica was found in 15 of them. Three sites (Tibraq, Siginitti and Arazat) had Schistosoma infected snails, the first snails shedding cercariae of this parasite ever collected in Oman. The parasite from Dhofar was analysed by Random Amplified Polymorphic DNA comparisons using 11 primers and 167 polymorphic fragments and had 87–88% similarity with Schistosoma mansoni from Guadeloupe, but only 37–38% similarity with S. rodhaini from Burundi. Thus, it is a strain of S. mansoni. During the November 2000 survey, the prosobranch snail Melanoides tuberculata was associated with B. arabica in 10 of the 13 B. arabica sites. Cercariae from other species of Digenea emerged from five of the B. arabica sites, including the three named above. This paper presents the first finding of S. mansoni in the Dhofar Governorate and represents an initial study of the biology of S. mansoni transmission. This parasite and its cycle need further biological and molecular characterization, and the clarification of its epidemiological status in Dhofar Governorate is an urgent task.

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Observations on the field transmission dynamics of Schistosoma mansoni and S. mattheei in southern Natal, South Africa

Cited by 17 publications

References 18 publications

Evaluation of Chemical and Physical-morphological Factors as Potential Determinants of Biomphalaria pfeifferi (Krauss, 1848) Distribution

Evaluation of Chemical and Physical-morphological Factors as Potential Determinants of Biomphalaria pfeifferi (Krauss, 1848) Distribution

Modern and early Holocene mollusc fauna of the Ounianga lakes (northern Chad): implications for the palaeohydrology of the central Sahara

Ecological and molecular studies on emerging schistosomiasis mansoni in Dhofar Governorate, Sultanate of Oman

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