Ocorrência de Trypanosoma evansi em bovinos de uma propriedade leiteira no município de Videira - SC, Brasil

Silva, Aleksandro S. Da; Oliveira, Camila Belmonte; Zanette, Régis Adriel; Soares, Claudia Dal Molin; Coradini, Gabriela Pesamosca; Polenz, Carlos Henrique; Santúrio, Jânio Morais; Monteiro, Sílvia González

doi:10.22456/1679-9216.16133

Cited by 9 publications

(4 citation statements)

References 18 publications

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“…The few studies that exist on the seasonality of the Tabanidae in southern Brazil show D. alcicornis to be one of the most abundant species of this family in the region [6,9,10], as also found in the present study. The circulation of T. evansi in southern Brazil has already been demonstrated in several studies [14,[27][28][29], but this is the first one, to the best of our knowledge, in which the DNA of this parasite has been detected in the mouthparts of members of the Tabanidae. The sequenced PCR products showed high identity with the deposited sequences in GenBank, which is considered evidence of the presence of T. evansi DNA in the mouthparts of the tabanids examined here.…”

Section: Discussionmentioning

confidence: 68%

First record of Trypanosoma evansi DNA in Dichelacera alcicornis and Dichelacera januarii (Diptera: Tabanidae) flies in South America

et al. 2023

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Background Trypanosoma evansi infects a large number of wild and domestic animals and causes a spoliative disease known as surra. It is mechanically transmitted, mainly by biting flies of the genera Tabanus and Stomoxys. The detection of T. evansi DNA in the feeding apparatus of Dichelacera alcicornis and Dichelacera januarii from South America is reported, to the best of our knowledge, for the first time. Methods Tabanids were collected weekly from February 2018 to February 2019 from two sites. The feeding apparatus was removed and DNA extraction, polymerase chain reaction and sequencing were performed. Results A 205-base pair fragment of the variant surface protein RoTat 1.2 gene, confirmed by DNA sequencing, was amplified from the feeding apparatus of D. alcicornis and D. januarii. Conclusions This is, to the best of our knowledge, the first record of T. evansi DNA in South American tabanids. Graphical abstract

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Section: Discussionmentioning

confidence: 68%

First record of Trypanosoma evansi DNA in Dichelacera alcicornis and Dichelacera januarii (Diptera: Tabanidae) flies in South America

et al. 2023

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“…T. evansi pode estar presente em bovinos, no entanto, raramente é associado às manifestações clínicas da tripanossomose (16,17). No Brasil, este agente possui como principal hospedeiro os equinos.…”

Section: Agente Etiológicounclassified

“…No Brasil, este agente possui como principal hospedeiro os equinos. Alguns animais silvestres podem ser reservatórios, como as capivaras, consideradas os principais reservatórios da infecção (13,16).…”

Section: Agente Etiológicounclassified

Tripanossomose Em Bovinos

Caramori¹,

Magalhães²,

Grando³

2022

RVZ

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Ao possuir um dos maiores rebanhos comerciais de bovinos do mundo, o Brasil destaca-se entre os demais países, entretanto, dentre os problemas sanitários que acometem esses rebanhos a tripanossomose vem ganhando espaço e grande significância, devido aos grandes problemas econômicos e reprodutivos que vem causando no rebanho brasileiro. O agente de maior importância e causador é o Trypanossoma vivax, que são protozoários disseminados por meio de vetores mecânicos, como tabanídeos e moscas hematófagas como as do gênero Stomoxys. Esses agentes estão distribuídos por todo o mundo, mas preferencialmente em áreas de clima tropicais no Brasil, acometendo tanto bovinos leiteiros quanto bovinos de corte, causando grandes prejuízos aos criadores. Os sinais clínicos desta doença são inespecíficos, o que tem gerado preocupação pela disseminação e falta de diagnóstico dessa enfermidade, mas incluem, principalmente, anemia ou perda progressiva de peso, além de perda da produtividade dos animais acometidos. O diagnóstico é feito por meio de exames parasitológicos, como esfregaços sanguíneos, exames sorológicos e molecular e, principalmente, pelo método de Woo. Por fim o tratamento e controle dessa doença consiste em tratamentos quimioterápicos e controle dos vetores causadores. Neste sentido, esta breve revisão de literatura tem por objetivo levantar dados sobre tal doença, como: agente etiológico, sinais clínicos, epidemiologia, diagnóstico e tratamento, a fim de contribuir com informações sobre a enfermidade que está ganhando espaço e necessita de maior disseminação de conhecimentos, para que não seja esquecida e subdiagnosticada.

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“…In Brazil, the first outbreaks of the disease occurred in the state of Pará in ruminants (Boulhosa, 1946;Shaw & Lainson, 1972) and since then several others have been reported in the country, such as in Mato Grosso (Silva et al, 1996), Amapá and Rio de Janeiro (Madruga et al, 2006), Tocantins (Linhares et al, 2006), Paraíba (Batista et al, 2007), Santa Catarina (Silva et al, 2007), Maranhão (Guerra et al, 2008), Minas Gerais (Carvalho et al, 2008), Rio Grande do Sul (Silva et al, 2009), São Paulo (Cadioli et al, 2012), Goiás (Bastos et al, 2017), and Sergipe (Vieira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Diagnostic, Clinical and Epidemiological aspects of dairy cows naturally infected by Trypanosoma vivax in the states of Pernambuco and Alagoas, Brazil

et al. 2019

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Trypanosoma vivax is the most pathogenic hemoparasite of ruminants, causing huge economic losses to the producer when prevalent in the herd. This study aims to characterize the trypanosomiasis in naturally infected cattle in order to assess the clinical findings, epidemiological risk factors, and diagnosis of this disease in outbreaks occurring in the states of Pernambuco and Alagoas, northeastern Brazil. For this purpose, historical and clinical examinations, blood collection and clinical monitoring were performed in 109 animals presenting illness for a period of one year. The main clinical findings were fever, apathy, anorexia, diarrhea, progressive weight loss, lymphadenopathy, pale mucous, incoordination, aggressiveness, abortion, decrease in milk production, and high mortality. Out of 109animals, 94% (103/109) were seropositive to Trypanosoma vivax by ELISA, 92% (100/109) were seropositive for IFAT, 15% (17/109) were positive in conventional PCR assay based on the cathepsine L gene, and 9% (10/109) showed the presence of Trypanosoma vivax trypomastigotes in stained-blood smears. In 13 samples, blood counts revealed that 69.23% (9/13) showed normocytic normochromic anemia and 53.84% (7/13) had leukocytosis, in 46.15% (6/13) neutrophilia and regenerative left shift. In 72 samples, the hematocrit, plasma protein, and fibrinogen were also examines. The hematocrit presented an average of 22% (10% to 37%), plasma protein a mean value of 7.55 g/dl (5.4 g/dl to 10.0 g/dl), and plasma fibrinogen a mean value of 700mg/dl (200mg/dl to 1600mg/dl). The sequencing of DNA samples revealed 100% identicalness to Trypanosoma vivax by BLAST analysis. The main factors involved in the spread of the disease were: the ingress of animals without prior tests and quarantine into the properties, application of oxytocin with shared needles contaminated by blood at the time of lactation, and the restriction of the disease in the lactation herd. The transmission of Trypanosoma vivax occurred through the sharing of needles among lactating animals during application of oxytocin after the entry of carrier animals in the herd. Serological tests demonstrated a high rate of seropositive animals, however, conventional PCR and blood smears revealed a low positive rate because the animals were already being treated with trypanocid drugs. It is concluded that trypanosomiasis is a disease to be considered in the cattle regions studied as the cause of outbreaks. Hygiene and security actions should be taken during the administration of oxytocin in lactating cows. In fact, this practice, when performed using shared needles and without disinfection, is the main risk factor in the transmission of trypanosomiasis in dairy herds among regions where the disease is prevalent, increasing the challenge of reinfection of animals.

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Ocorrência de Trypanosoma evansi em bovinos de uma propriedade leiteira no município de Videira - SC, Brasil

Cited by 9 publications

References 18 publications

First record of Trypanosoma evansi DNA in Dichelacera alcicornis and Dichelacera januarii (Diptera: Tabanidae) flies in South America

First record of Trypanosoma evansi DNA in Dichelacera alcicornis and Dichelacera januarii (Diptera: Tabanidae) flies in South America

Tripanossomose Em Bovinos

Diagnostic, Clinical and Epidemiological aspects of dairy cows naturally infected by Trypanosoma vivax in the states of Pernambuco and Alagoas, Brazil

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