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

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

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.

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

Experimental Infection with Schistosoma Haematobium in Chimpanzees

1970 ◽  
Vol 19 (3) ◽  
pp. 427-458 ◽  
Author(s):  
E. H. Sadun ◽  
A. W. Cheever ◽  
D. G. Erickson ◽  
F. von Lichtenberg ◽  
R. L. Hickman
Keyword(s):  
Experimental Infection ◽  
Schistosoma Haematobium
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