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.

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

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.

The cercarial output from three Nigerian bulinids infected with two strains of Schistosoma haematobium

1988 ◽  
Vol 62 (2) ◽  
pp. 133-140 ◽  
Author(s):  
S. E. Fryer ◽  
A. J. Probert
Keyword(s):  
Schistosoma Haematobium ◽  
Daily Production ◽  
Bulinus Truncatus ◽  
Low Levels ◽  
Host Parasite ◽  
Second Period ◽  
Initial Peak

ABSTRACTThe daily cercarial output of two Nigerian strains of Schistosoma haematobium in sympatric Bulinus truncatus, B. globosus and B. senegalensis was measured at weekly intervals from the start of emission to the snails' death. In all cases cercariae were released throughout the life of the host, with no cases of “self cure”. Patterns of output through the course of infections in B. truncatus and B. senegalensis were similar to those reported for S. haematobium by other workers, with daily production of cercariae rising to a peak within a few weeks of the onset of shedding, then declining until the host's death. In the longer lived B. globosus production was significantly higher, but declined to very low levels after the initial peak; in some individuals cercarial output remained very low, while others showed a second period of high cercarial emission. The relative compatibility of each host-parasite combination is discussed.

scholarly journals Morphological and genomic characterisation of the Schistosoma hybrid infecting humans in Europe reveals admixture between Schistosoma haematobium and Schistosoma bovis

2021 ◽  
Vol 15 (12) ◽  
pp. e0010062
Author(s):  
Julien Kincaid-Smith ◽  
Alan Tracey ◽  
Ronaldo de Carvalho Augusto ◽  
Ingo Bulla ◽  
Nancy Holroyd ◽  
...  
Keyword(s):  
Genome Assembly ◽  
Schistosoma Haematobium ◽  
Cycle Progression ◽  
Bulinus Truncatus ◽  
Schistosoma Bovis ◽  
Long Read ◽  
Egg Morphology ◽  
Specific Species ◽  
The Tropics ◽  
Human Specific

Schistosomes cause schistosomiasis, the world’s second most important parasitic disease after malaria in terms of public health and social-economic impacts. A peculiar feature of these dioecious parasites is their ability to produce viable and fertile hybrid offspring. Originally only present in the tropics, schistosomiasis is now also endemic in southern Europe. Based on the analysis of two genetic markers the European schistosomes had previously been identified as hybrids between the livestock- and the human-infective species Schistosoma bovis and Schistosoma haematobium, respectively. Here, using PacBio long-read sequencing technology we performed genome assembly improvement and annotation of S. bovis, one of the parental species for which no satisfactory genome assembly was available. We then describe the whole genome introgression levels of the hybrid schistosomes, their morphometric parameters (eggs and adult worms) and their compatibility with two European snail strains used as vectors (Bulinus truncatus and Planorbarius metidjensis). Schistosome-snail compatibility is a key parameter for the parasites life cycle progression, and thus the capability of the parasite to establish in a given area. Our results show that this Schistosoma hybrid is strongly introgressed genetically, composed of 77% S. haematobium and 23% S. bovis origin. This genomic admixture suggests an ancient hybridization event and subsequent backcrosses with the human-specific species, S. haematobium, before its introduction in Corsica. We also show that egg morphology (commonly used as a species diagnostic) does not allow for accurate hybrid identification while genetic tests do.

Observations on compatibility between Bulinus truncatus and Schistosoma haematobium in the Senegal River Basin

1997 ◽  
Vol 91 (4) ◽  
pp. 371-378 ◽  
Author(s):  
D. Rollinson ◽  
D. De Clercq ◽  
M. Sacko ◽  
M. Traoré ◽  
M. Sene ◽  
...  
Keyword(s):  
River Basin ◽  
Schistosoma Haematobium ◽  
Bulinus Truncatus ◽  
Senegal River ◽  
Senegal River Basin

scholarly journals Schistosoma haematobiumin Lake Malaŵi: susceptibility and molecular diversity of the snail hostsBulinus globosusandB. nyassanus

2008 ◽  
Vol 82 (4) ◽  
pp. 377-382 ◽  
Author(s):  
J.R. Stauffer ◽  
H. Madsen ◽  
B. Webster ◽  
K. Black ◽  
D. Rollinson ◽  
...  
Keyword(s):  
Genetic Variability ◽  
Causative Agent ◽  
Schistosoma Haematobium ◽  
Species Complex ◽  
Molecular Diversity ◽  
Lake Malawi ◽  
Intermediate Hosts ◽  
Urinary Schistosomiasis ◽  
Bulinus Globosus ◽  
Mitochondrial Sequences

AbstractIntermediate hosts ofSchistosoma haematobium, the causative agent of urinary schistosomiasis, in Lake Malaŵi include:Bulinus globosus, a member of theB. africanusgroup andB. nyassanus, a diploid member of theB. truncatus/tropicusspecies complex. We compared genetic variability between isolates ofS. haematobiumfrom the southern part of the lake (Cape Maclear), where bothB. globosusandB. nyassanusplay a role as intermediate hosts, and isolates from the northern part, where onlyB. globosusis host. Data show that theS. haematobiumisolates from these two areas of Lake Malaŵi cannot be distinguished using nuclear or mitochondrial sequences and are capable of cross-infections.

Dynamics of the intramolluscan larval development of Schistosoma haematobium: replication of daughter sporocysts and cercarial production

1989 ◽  
Vol 63 (1) ◽  
pp. 1-5 ◽  
Author(s):  
N. Kechemir ◽  
A. Théron
Keyword(s):  
Larval Development ◽  
Schistosoma Haematobium ◽  
Snail Host ◽  
Bulinus Truncatus ◽  
Cercarial Production

ABSTRACTDuring the intramolluscan larval development of Schistosoma haematobium (Algerian strain) in Bulinus truncatus, two replication processes of daughter sporocysts occur. Replication by direct sporocystogenesis appears more important than sporocystogenesis post cercariogenesis. These mechanisms assure a periodic renewal of the sporocyst stock in the snail host and seem to be synchronized with the development of cercarial generations. The succession of several generations of cercariae is responsible for the alternation of high and low periods of productivity.The scheme proposed for the intramolluscan development of S. haematobium is compared with those described for S. mansoni and S. bovis and interpreted in terms of demographic strategies adapted to a better exploitation of the snail host.

Experimental Infection of Bulinus truncatus with Schistosoma haematobium

1953 ◽  
Vol 39 (2) ◽  
pp. 215 ◽  
Author(s):  
Donald V. Moore ◽  
Carlos J. Thillet ◽  
Dorothy M. Carney ◽  
Henry E. Meleney
Keyword(s):  
Experimental Infection ◽  
Schistosoma Haematobium ◽  
Bulinus Truncatus
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