Detecção de anticorpos IgG anti-Trypanosoma vivax em bovinos através do teste de Imunofluorescência indireta

Guerra, Neurisvan Ramos; Monteiro, Maria Fernanda Melo; Sandes, H. M.M.; Cruz, Nadine Louise Nicolau da; Ramos, Carlos A. N.; Santana, Vania Lucia de Assis; Souza, Marcília Maria Alves de; Alves, Lêucio Câmara

doi:10.1590/s0100-736x2013001200005

Cited by 10 publications

(12 citation statements)

References 22 publications

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“…True prevalence rate of T. vivax at individual level was 9.9%, similar to the rate found in the first and only outbreak of trypanosomiasis by T. vivax reported in Minas Gerais so far (7.4%) on a dairy farm in Igarapé, metropolitan mesoregion of Belo Horizonte (15) , and below the rate found in Pernambuco, 14% (8) . However, prevalence rates of 30.7-93.1% are not uncommon in Brazilian endemic areas such as Pantanal and North Region (9,39,40) , well above those reported in Southern Minas Gerais.…”

Section: Discussionsupporting

confidence: 80%

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SEROPREVALENCE OF Trypanosoma vivax, Anaplasma marginale, and Babesia bovis IN DAIRY CATTLE

et al. 2016

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In order to determine the prevalence of IgG against Trypanosoma vivax, Anaplasma marginale, and Babesia bovis in dairy cattle in southern Minas Gerais, four hundred cows from 40 dairy farms were randomly selected and distributed in 14 municipalities. Seroprevalence was determined by indirect immunofluorescence assay (IFA). Interviews were conducted to characterize producers and dairy production. Univariate analysis was carried out using chi-square (x2) or Fisher's exact test. The multiple model was constructed with variables associated with p ≤ 0.25 by x2 test using generalized estimating equations (GEE). True prevalence at herd level was 49.6% (31.7-67.5), 100% (92.1-100), and 100% (86.5-100) for T. vivax, A. marginale, and B. bovis, respectively. At individual level, true seroprevalence was 9.9% (6.7-13.1), 96.2% (92.1-99.6), and 93.7% (89.4-97.2), respectively, for T. vivax, A. marginale, and B. bovis. Among the factors adjusted by logistic regression GEE model, "total farm area" (p= 0.021, OR= 0.308, Ic95%= 0.114-0.836) and "fly season" (p= 0.016, OR= 2.133, Ic95%= 1.153-3.948) remained associated with seropositivity for T. vivax. As the State of Minas Gerais is considered non-endemic for T. vivax, producers and veterinarians should be informed about the risk of occurrence of bovine trypanosomiasis.

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Section: Discussionsupporting

confidence: 80%

“…For about two decades, this parasite was restricted to the North region, also occurring in the state of Amapá (5) . However, further outbreaks of bovine trypanosomiasis caused by T. vivax were confirmed in the North (6) , Northeast (7,8) , Midwest (9,10) , Southeast (11,12) , and South (13) .…”

Section: Introductionmentioning

confidence: 99%

SEROPREVALENCE OF Trypanosoma vivax, Anaplasma marginale, and Babesia bovis IN DAIRY CATTLE

et al. 2016

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“…Most reports relate to isolated outbreaks, in which T. vivax acutely affects cattle, manifested by high parasitemia associated with clinical signs such as fever, anorexia, weight loss, sudden drop in milk production, abortion, and perinatal mortality. However, in the Northeast region of Brazil, the work carried out by GUERRA et al (2013) in cattle from herds of the municipalities of the state of Pernambuco found the prevalence of 13.93% (286/2053) of seropositive animals in the indirect immunofluorescence reaction.…”

Section: Discussionmentioning

confidence: 98%

“…The Northern region and the Mato Grosso Pantanal can be considered as enzootic stability for trypanosomiasis (GUERRA et al, 2013). Due to the abundance of mechanical vectors, most of the year, the animals develop active immunity.…”

Section: Introductionmentioning

confidence: 99%

Risk factors for trypanosomiasis by Trypanosoma vivax in cattle raised in Rio Grande do Norte state

et al. 2018

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The objective of this study was to determine the prevalence of anti Trypanosoma vivax antibodies and the possible risk factors associated with the infection in cattle in Rio Grande do Norte, Northeastern Brazil, through a cross-sectional epidemiological study, with non-probabilistic convenience sampling. A total of 467 cattle’s serum samples were analyzed by indirect immunofluorescence. Forty-two samples tested positive for Trypanosoma vivax IgG antibodies, corresponding to the prevalence of 9%. Risk factors influencing the occurrence of trypanosomiasis were milk exploration, raising of European breeds, productivity category: lactation cow, purchase of new cattle, foraging habits near ponds and rivers, and the presence of mechanical vectors. So, high prevalence in beef animals (59.5%), females (95.2%), European breed (88.1%), lactating cows (85.7%), pasture at banks of dams and rivers (95.2%), in addition to the presence of mechanical vectors (81%) and acquisition of animals (88.1%), indicates the expansion of trypanosomiasis in Northeastern semi-arid region, and the information obtained may explain the epidemiological factors that determine the occurrence of trypanosomiasis by T. vivax in this region.

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“…The diagnosis of the disease can be made by a combination of assessment of the clinical picture and parasitological, serological, and molecular techniques. In general, the diagnostic methods used to identify T. vivax are the detection of the hemoparasite by means of direct blood smear, serological assays such as indirect immunofluorescence assay (IFA) (Guerra et al, 2013), enzyme-linked immunosorbent assay (ELISA) ( et al, 2006), and molecular detection by polymerase chain reaction (PCR) (Vieira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Trypanosoma vivax Epizootic Infection in Cattle from Espírito Santo State, Brazil

Schmith¹,

Moreira²,

Vassoler³

et al. 2020

Adv. Anim. Vet. Sci.

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Bovine trypanosomiasis is a parasitic disease caused by the protozoan Trypanosoma vivax. This disease causes high morbidity and mortality in the herd and is thus responsible for low economic savings in cattle farming. The objective of this study was to report the occurrence of trypanosomiasis due to T. vivax in Espírito Santo, Brazil. The animals had reduced milk production, intermittent fever, anorexia, apathy, births of weak cattle, and adult mortality after progressive weight loss. Complete blood count and hematozoa were investigated. In the hematological analysis, the trypomastigote form of T. vivax was observed. This was the first report of the occurrence of T. vivax in the State of Espírito Santo. The results of this paper show the importance of carrying out studies to diagnose the epidemiological situation of the disease within the productive context of regions that manage dairy farming with severe symptoms of the disease. Therefore, the occurrence of trypanosomiasis can have a negative impact on the health and economics of local cattle farming.

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Detecção de anticorpos IgG anti-Trypanosoma vivax em bovinos através do teste de Imunofluorescência indireta

Cited by 10 publications

References 22 publications

SEROPREVALENCE OF Trypanosoma vivax, Anaplasma marginale, and Babesia bovis IN DAIRY CATTLE

SEROPREVALENCE OF Trypanosoma vivax, Anaplasma marginale, and Babesia bovis IN DAIRY CATTLE

Risk factors for trypanosomiasis by Trypanosoma vivax in cattle raised in Rio Grande do Norte state

Trypanosoma vivax Epizootic Infection in Cattle from Espírito Santo State, Brazil

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