Susceptibility of Biomphalaria straminea from Peixe Angical dam, Tocantins, Brazil to infection with three strains of Schistosoma mansoni
Mem. Inst. Oswaldo Cruz
;
105(4): 488-491, July 2010. tab
Article
in English
| LILACS
| ID: lil-554818
ABSTRACT
Environmental changes from water resource developmental projects affect the epidemiology of water-associated diseases, as well as malaria and schistosomiasis. Aiming to investigate the occurrence and distribution of freshwater snails of medical and veterinary importance in the area of influence of the Peixe Angical hydroelectric dam, a survey has been conducted over four years (2004-2008). The study has revealed the occurrence of populations of Biomphalaria straminea (Dunker) in all municipalities surrounding the lake. Studies on parasite-mollusc compatibility were undertaken using 35 populations of B. straminea, descendants of specimens obtained from that area and three strains of Schistosoma mansoni (Sambon) (BH, CM and CMO). The main results are as follows (i) among the 1,314 specimens used, eight had been infected (infection index of 0.6 percent) with only the BH strain, (ii) for B. straminea populations, the mortality index was 6.8 percent and, depending on the strain used, the indexes were 4.6 percent, 8.49 percent and 19 percent with BH, CM and CMO strains, respectively, (iii) the infection indexes varied according to the B. straminea populations, ranging from 0-12.5 percent and (iv) the duration of the precercarial period varied from 25-49 days. These results, in addition to environmental and social changes that took place in the Peixe Angical dam region, indicate the possibility of B. straminea emerging as a schistosomiasis vector in this area.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Schistosoma mansoni
/
Biomphalaria
/
Disease Vectors
/
Host-Parasite Interactions
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2010
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Fiocruz/BR
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