Ocorrência de linhagens humana e silvestre de Schistosoma mansoni, na pré-amazônia: I - estudo em moluscos

Bastos, Othon; Silva, Argélia Maria Andrade; Souza, Eliane Pires de; Neto, Raimundo Carlos Lemos; Piedrabuena, Aquiles Eugênico

doi:10.1590/s0034-89101982000500004

Cited by 13 publications

(6 citation statements)

References 8 publications

(4 reference statements)

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“…However, there have been only two reports where N. rattus (formerly named N. squamipes amazonicus) were found naturally infected (Bastos et al 1982(Bastos et al , 1984.…”

mentioning

confidence: 99%

Susceptibility of Nectomys rattus (Pelzen, 1883) to experimental infection with Schistosoma mansoni (Sambon, 1907): a potential reservoir in Brazil

Ribeiro

Maldonado

D’Andrea

et al. 1998

Mem. Inst. Oswaldo Cruz

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The aim of the present research was to evaluate the potential of Nectomys rattus, the "water rat", to develop Schistosoma mansoni infection. Comparison Key words: Nectomys rattus -Nectomys squamipes -wild rodent -Schistosoma mansoni -experimental infectionThe occurrence of wild populations of small rodent naturally infected in endemic schistosomiasis areas had been considered as an additional complication factor for the control of the disease (Rey 1993).The species Nectomys squamipes, the "water rat", is one of the most important non-human hosts for Schistosoma mansoni in Brazil (Antunes et al. 1973, Picot 1992. This species excretes viable eggs of the parasite during its hole life-span (RodriguesSilva 1988) and shows strong fitness to parasitism . Furthermore, N. squamipes has a high susceptibility to experimental infection (Souza et al. 1992), reinfection (Maldonado Jr. et al. 1994), and with a moderate pathogenic response (Silva & Andrade 1989 at the eastern Brazilian coast, from north of the municipality of São Lourenço da Mata (State of Pernambuco) to the Amazon river. That new given designation is N. rattus (2n=52).N. squamipes (2n=56) distribution has been restricted to the Atlantic coast of Brazil, in the basins of São Francisco river and Paraná river, as well as in the small independent basins of southern São Lourenço da Mata, in eastern Brazil.The broad distribution of N. rattus includes endemic areas of schistosomiasis apart from those where N. squamipes are found. However, there have been only two reports where N. rattus (formerly named N. squamipes amazonicus) were found naturally infected (Bastos et al. 1982(Bastos et al. , 1984.The aim of this research was to evaluate the potential of N. rattus to develop S. mansoni infection, and its ability to complete the parasite's life cycle under experimental conditions. All results were compared to the N. squamipes relation with S. mansoni infection. MATERIALS AND METHODSExperimental groups -Thirty seven specimens of N. rattus and 58 specimens of N. squamipes of both sexes, aged 3 to 5 months and weighing 250 to 300 g were used. All experimental animals were raised in our laboratory colonies (D'Andrea et al. 1996). The colony of the N. rattus derived from animals captured in the State of Goiás

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“…However, there have been only two reports where N. rattus (formerly named N. squamipes amazonicus) were found naturally infected (Bastos et al 1982(Bastos et al , 1984.…”

mentioning

confidence: 99%

Susceptibility of Nectomys rattus (Pelzen, 1883) to experimental infection with Schistosoma mansoni (Sambon, 1907): a potential reservoir in Brazil

Ribeiro

Maldonado

D’Andrea

et al. 1998

Mem. Inst. Oswaldo Cruz

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“…In the Maranhão state, more precisely in the Baixada Ocidental Maranhense, some rare and old studies also proposed to establish possible differences between these strains. According to Bastos et al (1982), when they verifi ed the virulence pattern of S and H strains (from Maranhão) in B. glabrata collected in the same area of occurrence of naturally infected rodents, it was observed that S strain was three times more virulent than H strain. For the authors, these data strongly suggest that there are suffi cient reasons to demonstrate that the two strains have some level of isolation in the nature, due to the existence of differences to the para sitological behavior in mollusks.…”

Section: The Wild and Human Strainmentioning

confidence: 99%

Research Note. The wild water-rats and their relevance in the context of schistosomiasis mansoni in Brazil: what we know and recommendations for further research

Miranda

Rodrigues

et al. 2017

Helminthologia

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SummarySchistosomiasis is a parasitic and endemic disease in several parts of the world. Its mortality rate reaches alarming proportions, which makes emergency the control of this disease. In Brazil, only the species Schistosoma mansoni was adapted to the climatic conditions and to the presence of appropriate hosts. This species shows a life cycle involving mollusks Biomphalaria spp. and humans. However, it has been shown that wild rodents with semi-aquatic habits are capable to establish a productive infection of this parasite. In addition, they are likely also to be capable to spread the disease in endemic areas. Due to the selective pressure exerted by the successive infections in these animals, we may be watching the development of a new strain of the parasite, which is not yet fully defi ned and understood. With the intention of directing new studies to this problem, we tried to establish main lines of research to demonstrate the real importance of these wild rodents in the epidemiology of schistosomiasis mansoni in Brazil.

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“…Studies of the participation of these rodents in schistosomiasis only mention N. squamipes, except for Bastos et al (1982Bastos et al ( , 1984, who reported naturally infected Nectomys squamipes amazonicus (currently Nectomys rattus (Pelzen (1883)). The water-rat Nectomys squamipes (Sigmodontinae) occurs in the Atlantic Forest, Rio São Francisco and Paraná Basins, and in small basins of Eastern Brazil below São Lourenço da Mata, Pernanbuco State, embracing the South, Southern and part of the Northeast regions (Fig.…”

Section: The Most Important Species Of Reservoir: Water-ratsmentioning

confidence: 99%

The Role of Wild Rodents in the Transmission of Schistosoma mansoni in Brazil

Gentile¹,

Soares²,

Barreto³

et al. 2012

Schistosomiasis

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Ocorrência de linhagens humana e silvestre de Schistosoma mansoni, na pré-amazônia: I - estudo em moluscos

Cited by 13 publications

References 8 publications

Susceptibility of Nectomys rattus (Pelzen, 1883) to experimental infection with Schistosoma mansoni (Sambon, 1907): a potential reservoir in Brazil

Susceptibility of Nectomys rattus (Pelzen, 1883) to experimental infection with Schistosoma mansoni (Sambon, 1907): a potential reservoir in Brazil

Research Note. The wild water-rats and their relevance in the context of schistosomiasis mansoni in Brazil: what we know and recommendations for further research

The Role of Wild Rodents in the Transmission of Schistosoma mansoni in Brazil

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