Topic
Bulinus truncatus
About: Bulinus truncatus is a research topic. Over the lifetime, 414 publications have been published within this topic receiving 5640 citations.
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TL;DR: Three chaetotaxic indices, AD, AL and U, of cercariae of four pre-identified African Schistosoma species, obtained from natural or experimental infections, were established, and the simple comparison of average values of one or two of these three indices facilitated identification of the cercarie of Schistooma haematobium and S. forskalii.
Abstract: Trois indices chetotaxiques AD, AL et U, des cercaires de quatre especes pre-identifiees de Schistosoma africains, emises par des Mollusques infestes naturellement ou experimentalement, ont ete calcules. AD et AL correspondant respectivement a la distance relative entre les papilles dorsales et les papilles laterales. U correspond au nombre total des papilles du tronc caudal. La simple comparaison des moyennes arithmetiques d'un ou deux de ces trois indices permet de distinguer les cercaires de Schistosoma haematobium et de S. curassoni emises par Bulinus umbilicatus; les cercaires de S. haematobium et S. bovis emises par B. truncatus; les cercaires de S. bovis et S. intercalatum emises par B. forskalii.
4 citations
TL;DR: It was shown that five generations of relatively mild selection resulted in a significant increased tolerance to niclosamide in snails with only one exposure before start of the selection procedure.
Abstract: Survivors of Bulinus truncatus from one exposure to niclosamide (Bayluscide) were used to establish the next generation in a five generation long laboratory selection for increased tolerance to niclosamide. In a comparison of the tolerance to the molluscicide between two original and two selected strains about 150 snails of each strain, divided into four size-groups, were exposed to aliquots of the same niclosamide solution on the same day and during the same time of the day. It was shown that five generations of relatively mild selection (30-50% survival) resulted in a significant increased tolerance to niclosamide in snails with only one exposure before start of the selection procedure. A comparison with published data indicated that the unselected strains did not change their tolerance to niclosamide during seven years of laboratory breeding. The strain exposed to niclosamide once in each of 16 generations showed an avoidance reaction to the chemical by crawling out of the water.
3 citations
DOI•
06 Jul 2017
TL;DR: Results showed that the LC25 of the extracts of E. pulcherima and A. nummularia caused a considerable reduction in the infectivity of The Bulinus truncatus.
Abstract: Effects of extracts of Euphorbia pulcherima and Atriplex nummularia on infection rate and cercarial production of The Bulinus truncatus infected with Schistosoma haematobium, as well as on the free living stages of the parasite (miracidia and cercariae) besides biochemical parameters of the snail were studied. The results showed that the LC25 of the extracts of E. pulcherima and A. nummularia caused a considerable reduction in the infectivity
3 citations
Journal Article•
3 citations
TL;DR: It is concluded that the occurrence of periods of exceptionally high salinity in the Shatt-al-Arab and Bahmashir rivers, the source of all fresh water on the island, may be responsible for the death of all active Bulinus during these periods.
Abstract: 1. (1) Urinary bilharziasis due to Bilharzia haematobia in Southern Iran has received little attention in the past. Increase in recent years in the number of cases among employees of the Anglo-Iranian Oil Company on Abadan Island led to investigation of the incidence and epidemiology of the disease in this area. 2. (2) Several hundred urines collected in Abadan and Ahwaz, mainly from labourers employed by the Company, contained no bilharzia ova; but it was not possible to extend the survey through the whole region. The exact distribution and incidence of the disease therefore remain to be discovered. However, the facts available point to an extension of the heavily endemic area of the Amarah marshes in Iraq eastwards to the region surrounding the Iranian city of Ahwaz. Cases occurring in persons on Abadan Island who had never left Iran were generally traceable to this area; and the inhabitants of some of the villages between Ahwaz and the Iraq border reported that haematuria and painful micturition were not uncommon among them. 3. (3) Snail survey on Abadan Island, around Ahwaz and in the settlements between Ahwaz and the border revealed no Bulinus truncatus nor other vector species. In view, however, of the continuity of the area between Ahwaz and the border with the Bulinus-infested Amarah marshes on the east bank of the lower Tigris and of the occurrence therein of suitable habitats, it is likely that thorough search will reveal the presence of these snails there. 4. (4) On Abadan Island, on the other hand, it seems to be improbable that Bulinus will be found to occur. The conditions are almost identical with those on the opposite bank of the Shatt-al-Arab south of the city of Basrah where, despite diligent search, Bulinus has never been found. 5. (5) The possible nature of the factors which prevent colonization of the waters on Abadan Island and south of Basrah by Bulinus is discussed. It is concluded that the occurrence of periods of exceptionally high salinity in the Shatt-al-Arab and Bahmashir rivers, the source of all fresh water on the island, may be responsible. During such periods salinity rises high enough to be rapidly lethal to all active Bulinus.
3 citations