Natural infection of wild rodents by Schistosoma mansoni parasitological aspects
The evaluation of the role of rodents as natural hosts of Schistosoma mansoni was studied at the Pamparrão Valley, Sumidouro, RJ, with monthly captures and examination of the animals. Twenty-three Nectomys squamipes and 9 Akodom arviculoides with a shistosomal infection rate of 56.5% and 22.2% respe...
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| Format: | Article |
| Language: | English |
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Fundação Oswaldo Cruz (FIOCRUZ)
1992-01-01
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| Series: | Memorias do Instituto Oswaldo Cruz |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761992000500051 |
| _version_ | 1797703179716001792 |
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| author | Rosângela Rodrigues e Silva José Roberto Machado e Silva Nilcéa Freire Faerstein Henrique Leonel Lenzi Luis Rey |
| author_facet | Rosângela Rodrigues e Silva José Roberto Machado e Silva Nilcéa Freire Faerstein Henrique Leonel Lenzi Luis Rey |
| author_sort | Rosângela Rodrigues e Silva |
| collection | DOAJ |
| description | The evaluation of the role of rodents as natural hosts of Schistosoma mansoni was studied at the Pamparrão Valley, Sumidouro, RJ, with monthly captures and examination of the animals. Twenty-three Nectomys squamipes and 9 Akodom arviculoides with a shistosomal infection rate of 56.5% and 22.2% respectively eliminated a great majority of viable eggs. With a strain isolated from one of the naturally infected N. squamipes, we infected 75% of simpatric Biomphalaria glabrata and 100% of albino Mus musculus mice. The adult worms, isolated from N. squamipes after perfusion were located mainly in the liver (91.5%) and the mesenteric veins (8.5%). The male/female proportion was 2:1. The eggs were distributed on small intestine segments (proximal, medial and distal portions) and the large intestine without any significant differences in egg concentration of these segments. In A. arviculoides, the few eggs eliminated by the stools were viable and there was litlle egg retention on intestinal segments. Considering the ease to complete S. mansoni biological cycle in the Nectomys/Biomphalaria/Nectomys system under laboratory conditions, probably the same is likely to occur in natural conditions. In support to this hypotesis there are also the facts that human mansonic shistosomiasis has a very low prevalence in Sumidouro and endemicity among the rodents has not changed even after repetead treatments of the local patients. Based on our experiments, we conclude that N. squamipes has become a natural host of S. mansoni and possibly may participate in keeping the cycle of schistosomiasis transmission at Pamparrão Valley. |
| first_indexed | 2024-03-12T05:00:51Z |
| format | Article |
| id | doaj.art-5989352156084812b2d729b33ed2bf25 |
| institution | Directory Open Access Journal |
| issn | 0074-0276 1678-8060 |
| language | English |
| last_indexed | 2024-03-12T05:00:51Z |
| publishDate | 1992-01-01 |
| publisher | Fundação Oswaldo Cruz (FIOCRUZ) |
| record_format | Article |
| series | Memorias do Instituto Oswaldo Cruz |
| spelling | doaj.art-5989352156084812b2d729b33ed2bf252023-09-03T09:11:44ZengFundação Oswaldo Cruz (FIOCRUZ)Memorias do Instituto Oswaldo Cruz0074-02761678-80601992-01-018727127610.1590/S0074-02761992000500051Natural infection of wild rodents by Schistosoma mansoni parasitological aspectsRosângela Rodrigues e SilvaJosé Roberto Machado e SilvaNilcéa Freire FaersteinHenrique Leonel LenziLuis ReyThe evaluation of the role of rodents as natural hosts of Schistosoma mansoni was studied at the Pamparrão Valley, Sumidouro, RJ, with monthly captures and examination of the animals. Twenty-three Nectomys squamipes and 9 Akodom arviculoides with a shistosomal infection rate of 56.5% and 22.2% respectively eliminated a great majority of viable eggs. With a strain isolated from one of the naturally infected N. squamipes, we infected 75% of simpatric Biomphalaria glabrata and 100% of albino Mus musculus mice. The adult worms, isolated from N. squamipes after perfusion were located mainly in the liver (91.5%) and the mesenteric veins (8.5%). The male/female proportion was 2:1. The eggs were distributed on small intestine segments (proximal, medial and distal portions) and the large intestine without any significant differences in egg concentration of these segments. In A. arviculoides, the few eggs eliminated by the stools were viable and there was litlle egg retention on intestinal segments. Considering the ease to complete S. mansoni biological cycle in the Nectomys/Biomphalaria/Nectomys system under laboratory conditions, probably the same is likely to occur in natural conditions. In support to this hypotesis there are also the facts that human mansonic shistosomiasis has a very low prevalence in Sumidouro and endemicity among the rodents has not changed even after repetead treatments of the local patients. Based on our experiments, we conclude that N. squamipes has become a natural host of S. mansoni and possibly may participate in keeping the cycle of schistosomiasis transmission at Pamparrão Valley.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761992000500051Schistosoma mansoniwild rodentsNectomys squamipesAkodon arviculoidesnatural infection |
| spellingShingle | Rosângela Rodrigues e Silva José Roberto Machado e Silva Nilcéa Freire Faerstein Henrique Leonel Lenzi Luis Rey Natural infection of wild rodents by Schistosoma mansoni parasitological aspects Memorias do Instituto Oswaldo Cruz Schistosoma mansoni wild rodents Nectomys squamipes Akodon arviculoides natural infection |
| title | Natural infection of wild rodents by Schistosoma mansoni parasitological aspects |
| title_full | Natural infection of wild rodents by Schistosoma mansoni parasitological aspects |
| title_fullStr | Natural infection of wild rodents by Schistosoma mansoni parasitological aspects |
| title_full_unstemmed | Natural infection of wild rodents by Schistosoma mansoni parasitological aspects |
| title_short | Natural infection of wild rodents by Schistosoma mansoni parasitological aspects |
| title_sort | natural infection of wild rodents by schistosoma mansoni parasitological aspects |
| topic | Schistosoma mansoni wild rodents Nectomys squamipes Akodon arviculoides natural infection |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761992000500051 |
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