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High prevalence and intensity of fish nematodes with zoonotic potential in the Brazilian Amazon, including a brief reflection on the absence of human infections
Corrêa, Lincoln; Oliveira, Marcos Sidney Brito; Eiras, Jorge Guimarães da Costa; Tavares-Dias, Marcos; Adriano, Edson Aparecido.
  • Corrêa, Lincoln; Universidade Federal do Oeste do Pará - UFOPA. Pará. BR
  • Oliveira, Marcos Sidney Brito; Universidade Federal do Amapá (UNIFAP). Programa de Pós-Graduação em Biodiversidade Tropical. Macapá, AP. BR
  • Eiras, Jorge Guimarães da Costa; Universidade do Porto. Faculdade de Ciências. Departamento de Biologia. Porto, Portugal. BR
  • Tavares-Dias, Marcos; Empresa Brasileira de Pesquisa Agropecuária (Embrapa). Macapá, AP. BR
  • Adriano, Edson Aparecido; Universidade Federal de São Paulo (UNIFESP). Departamento de Ecologia e Biologia Evolutiva. Diadema, SP. BR
Rev. patol. trop ; 50(2): 1-13, jun. 2021. ilus
Article in English | LILACS | ID: biblio-1254586
ABSTRACT
This study aimed to characterize the prevalence, mean abundance, and mean intensity of potential fish-borne zoonotic nematode larvae infecting the predator fish Hoplias aff. malabaricus from the Tapajós River, in the municipality of Santarém, in the Brazilian Amazon. After capture, the specimens of H. aff. malabaricus were analyzed for infection by Contracaecum sp. and Eustrongylides sp. third-stage larvae, and the prevalence, mean abundance, and mean intensity were calculated. A literature search was carried out to clarify the relationship between these indicators and eventual human cases of infection in the Amazon region. Third-stage larvae of nematodes of the Contracaecum and Eustrongylides genera were found in the specimens of H. aff. malabaricus sampled from the Tapajós River. The prevalence of Contracaecum larvae was 100%, while its mean abundance and mean intensity were both 54.8 larvae/fish. The prevalence of Eustrongylides larvae was 62.9%, and its mean abundance and mean intensity were 1.8 and 2.8 larvae/fish, respectively. Despite the high prevalence and intensity values, there are no cases of human infection by these nematode larvae in the Brazilian Amazon reported. The absence of human infections by these nematode larvae in the Brazilian Amazon despite the high prevalence/intensity of Contracaecum and Eustrongylides larvae and the high consumption of fish in the region, is most probably due to the fact that the local populations do not eat raw or undercooked fish. However, it is noteworthy that the absence of zoonotic cases in the region is based only on the examination of the available published papers. A better knowledge of the situation would require surveying hospitals and clinics, and data from the region's medical treatment facilities. However, the authors consider that cases of human infection, if any, are extremely rare, mainly due to the eating habits of the local population.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Zoonoses / Fishes / Infections / Larva Type of study: Prevalence study / Risk factors Limits: Animals / Humans Country/Region as subject: South America / Brazil Language: English Journal: Rev. patol. trop Journal subject: Tropical Medicine / Pathology Year: 2021 Type: Article Affiliation country: Brazil / Portugal Institution/Affiliation country: Empresa Brasileira de Pesquisa Agropecuária (Embrapa)/BR / Universidade Federal de São Paulo (UNIFESP)/BR / Universidade Federal do Amapá (UNIFAP)/BR / Universidade Federal do Oeste do Pará - UFOPA/BR / Universidade do Porto/BR

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Full text: Available Index: LILACS (Americas) Main subject: Zoonoses / Fishes / Infections / Larva Type of study: Prevalence study / Risk factors Limits: Animals / Humans Country/Region as subject: South America / Brazil Language: English Journal: Rev. patol. trop Journal subject: Tropical Medicine / Pathology Year: 2021 Type: Article Affiliation country: Brazil / Portugal Institution/Affiliation country: Empresa Brasileira de Pesquisa Agropecuária (Embrapa)/BR / Universidade Federal de São Paulo (UNIFESP)/BR / Universidade Federal do Amapá (UNIFAP)/BR / Universidade Federal do Oeste do Pará - UFOPA/BR / Universidade do Porto/BR