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(Foto: Imagem de divulgação/Campanha Salve o Boto)(Foto: Imagem de divulgação/Campanha Salve o Boto)

Dois estudos realizados por cientistas de diferentes centros de pesquisa brasileiros constataram, pela primeira vez, a presença da bactéria Leptospira sp. em golfinhos e lobos-marinhos na costa do país. O microorganismo é o patógeno causador da leptospirose, doença que matou mais de 2,8 mil pessoas no Brasil nos últimos dez anos.

As pesquisas analisaram o DNA dos rins de mamíferos marinhos encontrados mortos. No estudo realizado com 142 golfinhos, os cientistas encontraram a bactéria em 21 indivíduos de cinco espécies: Stenella clymene, Sotalia guianensis, Pontoporia blainvillei, Steno bredanensis e Tursiops truncatus.  

Os pesquisadores constataram que a prevalência da bactéria nas espécies costeiras (25%, ou seja, 17 em 68 indivíduos estudados) é maior do que nas oceânicas, ou seja, aquelas que vivem mais afastadas do litoral (7,5%, ou quatro em 53 indivíduos).

A espécie com mais casos positivos para a bactéria foi o boto-cinza (Sotalia guianensis), encontrado em vários pontos das costas caribenha e brasileira, como a Baía de Guanabara, no Rio de Janeiro. O patógeno foi detectado em dez dos 21 indivíduos pesquisados (47,6%).  

Entre os golfinhos-do-Rio-da-Prata (Pontoporia blainvillei), encontrado entre a Argentina e o Sudeste do Brasil), a prevalência chegou a 33,4%, ou sete dos 21 animais estudados.  

Essa foi a primeira vez que a bactéria foi detectada nessas duas espécies costeiras e também no golfinho-Clímene (Stenella clymene), uma espécie oceânica.  

A fonte da contaminação é desconhecida e demanda novos estudos para ser confirmada, mas acredita-se que os animais sejam infectados por efluentes contaminados com urina de rato em áreas litorâneas próximas a grandes cidades, áreas portuárias e locais com saneamento básico precário.

Já entre os 47 lobos-marinhos de das espécies Arctocephalus australis e A. tropicalis foi encontrada a Leptospira sp em 15 indivíduos O patógeno foi mais comumente encontrado em indivíduos que habitam áreas com maior população humana.

Os pesquisadores consideram ser necessário continuar os estudos para entender o impacto que a Leptospira sp. tem no organismo dos animais marinhos brasileiros. Nos Estados Unidos, onde se estuda a relação do patógeno com leões-marinhos há mais de 50 anos, constatou-se que a leptospirose pode causar inflamação aguda nos rins dos animais, levando-os a encalhar com dores, desidratação, magreza e podendo ocasionar mortes.

“Ainda não foram encontradas evidências de lesões renais nos animais estudados [no Brasil], pois é necessário continuar avaliando outros parâmetros para confirmar se há manifestação clínica da doença em animais marinhos no Brasil”, afirma Felipe Torres, pesquisador da Universidade Federal Fluminense (UFF).

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