Freshwater snails and schistosomiasis mansoni in the State of Rio de Janeiro, Brazil: I - metropolitan mesoregion

Thiengo, Silvana Carvalho; Mattos, Aline Carvalho de; Santos, Sonia Barbosa dos; Fernandez, Mônica Ammon

doi:10.1590/s0074-02762001000900028

Cited by 55 publications

(52 citation statements)

References 9 publications

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“…In contrast to the other previously studied Mesoregions (Thiengo et al 2001(Thiengo et al , 2002a(Thiengo et al b, 2004) B. tenagophila was the only schistosomiasis vector found and the most frequent species, as it was observed in 34 districts.…”

Section: Resultscontrasting

confidence: 85%

“…The present study extended the geographical distribution of B. tenagophila in the state of Rio de Janeiro (Paraense 1986, Thiengo et al 1998, 2001, 2002ab, 2004 In relation to the non-vector planorbid species, D. anatinum was the most common, followed by D. cimex. In the previously studied mesoregions, the most frequent species were D. anatinum in the Metropolitana and Centro Fluminense Mesoregions (Thiengo et al 2001(Thiengo et al , 2002a, D. cimex in the Baixadas Mesoregion (Thiengo et al 2002b) and D. lucidum in the Sul Fluminense Mesoregion (Thiengo et al 2004).…”

Section: Discussionsupporting

confidence: 62%

“…In the previously studied mesoregions, the most frequent species were D. anatinum in the Metropolitana and Centro Fluminense Mesoregions (Thiengo et al 2001(Thiengo et al , 2002a, D. cimex in the Baixadas Mesoregion (Thiengo et al 2002b) and D. lucidum in the Sul Fluminense Mesoregion (Thiengo et al 2004). The distribution of A. nordestensis, previously known in 28 municipalities in the state (Thiengo et al 1998, Santos et al 1999, Thiengo et al 2001, 2002ab, 2004, is now extended to include Campos, Conceição de Macabu, Macaé, and São Fidélis.…”

Section: Discussionmentioning

confidence: 86%

“…An intensive and detailed survey of freshwater snails of the state of Rio de Janeiro has been performed by the authors since 1997 and the results were published in five papers (Thiengo et al 1998(Thiengo et al , 2001(Thiengo et al , 2002ab, 2004. Thus, aiming to carry on that survey collections were made from March, 2002to September, 2003 in the following municipalities of the Norte Fluminense Mesoregion: Carapebus, Conceição de Macabu, Macaé, Quissamã (Macaé Microregion), Campos dos Goytacazes, Cardoso Moreira, São Fidélis, São Francisco de Itabapoana, and São João da Barra (Campos dos Goytacazes Microregion).…”

mentioning

confidence: 99%

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Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: V - Norte fluminense mesoregion

Thiengo¹,

Mattos²,

Boaventura³

et al. 2004

Mem. Inst. Oswaldo Cruz

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Section: Resultscontrasting

confidence: 85%

Section: Discussionsupporting

confidence: 62%

Section: Discussionmentioning

confidence: 86%

mentioning

confidence: 99%

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Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: V - Norte fluminense mesoregion

Thiengo¹,

Mattos²,

Boaventura³

et al. 2004

Mem. Inst. Oswaldo Cruz

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“…In Brazil, only species from the genre Heleobia sp was found infected by N. risticii in the Southern region of the country (Coimbra et al 2006). A survey conducted by Thiengo et al (2001), found several snail genres in the Itaguai micro-region, including Heleobia sp. Thus, the presence of snails that participate in the EN transmission chain in this micro-region could justify the higher seropositivity for N. risticii in the equine.…”

Section: Discussionmentioning

confidence: 99%

Epidemiological survey of Neorickettsia risticii in equids from the State of Rio de Janeiro, Brazil

et al. 2016

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Equine neorickettsiosis (EN), also known as Potomac Horse Fever, is a non-contagious disease caused by the bacterium Neorickettsia risticii of the Anaplasmataceae family. The objectives of this study were to detect the presence of anti-N. risticii antibodies by the indirect immunofluorescence assay (IFA) and of its DNA by qPCR in equids at high and low altitude regions in the State of Rio de Janeiro, Brazil, and to identify factors associated with seropositive equids by multiple logistic regression analysis. The frequency of anti-N. risticii antibodies was 16.05% (n=113/704). The animal age and breeding region were the factors that influenced the seropositivity rate for N. risticii in the equids (p<0.05). Equids from the lowland region had higher seropositivity (p<0.05; OR=5.87) compared to those of the mountain region. The presence of snails on the farm was a factor associated with this result (p<0.05; OR=2.88). In the lowland region, age of the animal and site of breeding were protective factors for the detection of antibodies anti-N. risticii in equids, with lower frequency of seropositivity in younger animals (p<0.05; OR=0.06) and in animals raised in dry areas (p<0.05; OR=0.22). The presence of the target DNA of N. risticii by qPCR was not observed in any of the samples tested. The existence of seropositive equids for N. risticii demonstrates a possible circulation of this agent in the studied area, and that the age related characteristics and equids breeding region are important factors regarding seropositivity in the State of Rio de Janeiro.

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Digenetic larvae in Schistosome snails from El Fayoum, Egypt with detection of Schistosoma mansoni in the snail by PCR

et al. 2014

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The present study aims to detect the digenetic larvae infections in Bulinus truncatus and Biomphalaria alexandrina snails and also PCR detection of Schistosoma mansoni infection. The snails were collected from different branches of Yousef canal and their derivatives in El Fayoum Governorate. The snails were investigated for infection through induction of cercarial shedding by exposure to light and crushing of the snails. The shed cercariae were S. mansoni, Pharyngeate longifurcate type I and Pharyngeate longifurcate type II from B. alexandrina, while that found in B. truncatus were Schitosoma haematobium and Xiphidiocercaria species cercariae. The seasonal prevalence of infection was discussed. Polymerase chain reaction was used for the detection of S. mansoni in the DNA from field collected infected and non infected snails. The results of PCR showed that the pool of B. alexandrina snails which shed S. mansoni cercariae in the laboratory, gave positive reaction in the samples. Pooled samples of field collected B. alexandrina that showed negative microscopic shedding of cercariae gave negative and positive PCR in a consecutive manner. Accordingly, a latent infection in the snail (negative microscopic) could be detected by using PCR.

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Freshwater snails and schistosomiasis mansoni in the State of Rio de Janeiro, Brazil: I - metropolitan mesoregion

Cited by 55 publications

References 9 publications

Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: V - Norte fluminense mesoregion

Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: V - Norte fluminense mesoregion

Epidemiological survey of Neorickettsia risticii in equids from the State of Rio de Janeiro, Brazil

Digenetic larvae in Schistosome snails from El Fayoum, Egypt with detection of Schistosoma mansoni in the snail by PCR

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