scholarly journals Pilot Malacology Surveys for the Intermediate Hosts of Schistosomiasis in Rural and Semi-Urban Areas of the Moyen-Ogooué Province, Gabon

2021 ◽  
Vol 7 (1) ◽  
pp. 1
Author(s):  
Jean Claude Dejon Agobé ◽  
Henry Curtis Kariuki ◽  
Jeannot Fréjus Zinsou ◽  
Yabo Josiane Honkpehedji ◽  
Martin Peter Grobusch ◽  
...  
Keyword(s):  
Species Diversity ◽  
Light Microscopy ◽  
Low Power ◽  
Intermediate Host ◽  
Urban Areas ◽  
Schistosoma Haematobium ◽  
Transmission Dynamics ◽  
Intermediate Hosts ◽  
Bulinus Truncatus ◽  
Predominant Species

The objective of this pilot malacological survey was to identify the snail intermediate hosts for Schistosoma haematobium in endemic rural and semi-urban areas of Gabon. Snails were collected, morphologically identified, and tested for infection by cercarial shedding. Released cercariae were morphologically identified using low-power light microscopy. A total of six species of snails were collected throughout the study area, with Bulinus truncatus, B. forskalii, and Potadoma spp. being the most predominant species collected. Only the Bulinus species were tested for infection by cercarial shedding, of which only B. truncatus shed cercariae. Some B. truncatus shed mammalian schistosome cercariae, while others shed Gymnocephalus cercariae. Our results indicate that B. truncatus appears to be a potential intermediate host of schistosomiasis in Gabon, where cases of S. haematobium, S. guineensis, and S. intercalatum infection are reported. However, it will be important to further understand the species diversity and transmission dynamics of schistosomes.

Compatibility of Schistosoma haematobium, S. intercalatum and their hybrids with Bulinus truncatus and B. forskalii

Parasitology ◽  
2003 ◽  
Vol 127 (3) ◽  
pp. 231-242 ◽  
Author(s):  
B. L. WEBSTER ◽  
V. R. SOUTHGATE
Keyword(s):  
Schistosoma Haematobium ◽  
Parental Species ◽  
Reciprocal Hybrid ◽  
Intermediate Hosts ◽  
Bulinus Truncatus ◽  
Hybrid Offspring ◽  
Species Analysis

Schistosoma haematobium and S. intercalatum readily hybridize with each other producing generations of viable hybrid offspring. Experiments were designed to investigate the infectivity and viability of the S. haematobium×S. intercalatum F1 and F2 hybrid larvae in their two intermediate snail hosts compared with the parental species. Analysis of the data obtained suggested that the S. haematobium [male ]×S. intercalatum [female] F1 hybrid miracidia were more infective to Bulinus truncatus than to B. forskalii, and also more infective to B. truncatus compared with the parental S. haematobium miracidia. This hybrid was also observed to have a greater cercarial productivity from both intermediate hosts and these cercariae were shown to be more infectious and to have a longer longevity compared with the cercariae of S. haematobium, S. intercalatum and the S. haematobium [female]×S. intercalatum [male ] F1 hybrid cercariae. The S. haematobium [female]×S. intercalatum [male ] F1 hybrid was shown not to be very successful in all stages of the investigations. The results indicate that the S. haematobium [male ]×S. intercalatum [female] F1 hybrid may have many reproductive advantages over the reciprocal hybrid and the parental schistosome species. The significance of the results is discussed in relation to the epidemiological consequences occurring in Loum, Cameroon, and other areas where S. haematobium and S. intercalatum are sympatric and able to hybridize.

Intraspecific variation inSchistosoma haematobiumfrom Algeria

1997 ◽  
Vol 71 (1) ◽  
pp. 29-34 ◽  
Author(s):  
N. Kechemir ◽  
A. Théron
Keyword(s):  
Growth Rate ◽  
Comparative Analysis ◽  
Intermediate Host ◽  
Schistosoma Haematobium ◽  
Snail Host ◽  
Intraspecific Polymorphism ◽  
Bulinus Truncatus ◽  
Bioclimatic Zone ◽  
Two Populations ◽  
Cercarial Emergence

AbstractA comparative analysis has been carried out between two populations ofSchistosoma haematobiumusing the same intermediate snail host,Bulinus truncatus, but originating from two distinct ecological areas of Algeria: Khemis-El-Khechna in a sub-humid mediterranean zone and Djanet in a saharan bioclimatic zone. Four parameters have been studied: the growth rate of adult worms, size and shape of the eggs, chronobiology of cercarial emergence and the compatibility with the intermediate host. Results showing divergences for all the characters studied are discussed for the origin of this intraspecific polymorphism ofS. haematobiumin Algeria.

scholarly journals New location for Bulinus truncatus (Audouin, 1827) (Gastropoda: Planorbidae) intermediate host of Schistosoma haematobium and its distribution in the Iberian Peninsula

Graellsia ◽  
2015 ◽  
Vol 71 (2) ◽  
pp. e030 ◽  
Author(s):  
Elías D. Dana ◽  
Juan García-de-Lomas ◽  
José L. Juan Bañón ◽  
Encarnación Esteban ◽  
María A. A. Grácio ◽  
...  
Keyword(s):  
Intermediate Host ◽  
Iberian Peninsula ◽  
Schistosoma Haematobium ◽  
Bulinus Truncatus ◽  
New Location

Developing species-specific primers to identify Bulinus truncatus and Bulinus beccari, the intermediate hosts of Schistosoma haematobium in Saudi Arabia

Gene ◽  
2012 ◽  
Vol 499 (2) ◽  
pp. 256-261 ◽  
Author(s):  
Osama M.S. Mostafa ◽  
Saad M. Bin Dajem ◽  
Ahmed Al-Qahtani ◽  
Essam H. Ibrahim ◽  
Saleh A.S. Al-Quraishy
Keyword(s):  
Saudi Arabia ◽  
Schistosoma Haematobium ◽  
Intermediate Hosts ◽  
Specific Primers ◽  
Bulinus Truncatus ◽  
Species Specific

Interactions between intermediate snail hosts of the genus Bulinus and schistosomes of the Schistosoma haematobium group

Parasitology ◽  
2001 ◽  
Vol 123 (7) ◽  
pp. 245-260 ◽  
Author(s):  
D. ROLLINSON ◽  
J. R. STOTHARD ◽  
V. R. SOUTHGATE
Keyword(s):  
Intermediate Host ◽  
Schistosoma Haematobium ◽  
Abiotic Factors ◽  
Human Pathogens ◽  
Intermediate Hosts ◽  
Parasite Relationship ◽  
Allele Specific ◽  
Specific Amplification ◽  
Species Groups ◽  
Host Parasite

Within each of the four species groups of Bulinus there are species that act as intermediate hosts for one or more of the seven species of schistosomes in the Schistosoma haematobium group, which includes the important human pathogens S. haematobium and S. intercalatum. Bulinus species have an extensive distribution throughout much of Africa and some surrounding islands including Madagascar, parts of the Middle East and the Mediterranean region. Considerable variation in intermediate host specificity can be found and differences in compatibility between snail and parasite can be observed over small geographical areas. Molecular studies for detection of genetic variation and the discrimination of Bulinus species are reviewed and two novel assays, allele-specific amplification (ASA) and SNaPshot™, are introduced and shown to be of value for detecting nucleotide changes in characterized genes such as cytochrome oxidase 1. The value and complexity of compatibility studies is illustrated by case studies of S. haematobium transmission. In Senegal, where B. globosus, B. umbilicatus, B. truncatus and B. senegalensis may act as intermediate hosts, distinct differences have been observed in the infectivity of different isolates of S. haematobium. In Zanzibar, molecular characterization studies to discriminate between B. globosus and B. nasutus have been essential to elucidate the roles of snails in transmission. B. globosus is an intermediate host on Unguja and Pemba. Further studies are required to establish the intermediate hosts in the coastal areas of East Africa. Biological factors central to the transmission of schistosomes, including cercarial emergence rhythms and interactions with other parasites and abiotic factors including temperature, rainfall, water velocity, desiccation and salinity are shown to impact on the intermediate host-parasite relationship.

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