Trypanosoma evansi isolated from capybara (Hidrochaeris hidrochaeris)

Muñoz, Karina; Chávez, Amanda

doi:10.1590/s0074-02762001000700009

Cited by 18 publications

(10 citation statements)

References 5 publications

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“…Other variables should be included in surveys of fauna of horse flies to verify patterns that may be related to habitats in different regions as well as the association between statistical models and epidemiological outbreaks of diseases that are caused by pathogens that can be transmitted by horse flies. We emphasize here that outbreaks of trypanosomiasis that are caused by Trypanosoma evansi in horses in Brazil occurred on properties that were very close to watercourses and included reports of capybara deaths at the same sites in the beginning of spring (Rodrigues et al Several studies have indicated that capybaras are important reservoirs for T. evansi (e.g., Franke et al Muñoz and Chavez ) and develop a chronic form of the disease (Herrera et al Muñoz and Chávez ). The areas in our study had capybaras, horses, and a substantial number of cattle livestock; these areas had high populations of T. triangulum that peaked in the spring and summer and this is important because this species is a candidate to be involved in the mechanical transmission of pathogens in flatter areas and the low coastal plain of southern Brazil.…”

Section: Discussionmentioning

confidence: 99%

Seasonal patterns of horse fly richness and abundance in the Pampa biome of southern Brazil

Krüger

Krolow

2015

Journal of Vector Ecology

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Fluctuations in seasonal patterns of horse fly populations were examined in rainforests of tropical South America, where the climate is seasonal. These patterns were evaluated with robust analytical models rather than identifying the main factors that influenced the fluctuations. We examined the seasonality of populations of horse flies in fields and lowland areas of the Pampa biome of southern Brazil with generalized linear models. We also investigated the diversity of these flies and the sampling effort of Malaise traps in this biome over two years. All of the 29 species had clear seasonality with regard to occurrence and abundance, but only seven species were identified as being influenced by temperature and humidity. The sampling was sufficient and the estimated diversity was 10% more than observed. Seasonal trends were synchronized across species and the populations were most abundant between September and March and nearly zero in other months. While previous studies demonstrated that seasonal patterns in population fluctuations are correlated with climatic conditions in horse fly assemblages in South America rainforests, we show a clear effect of each factor on richness and abundance and the seasonality in the prevalence of horse fly assemblages in localities of the Pampa biome. Journal of Vector Ecology 40 (2): 364-372. 2015.

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Section: Discussionmentioning

confidence: 99%

Seasonal patterns of horse fly richness and abundance in the Pampa biome of southern Brazil

Krüger

Krolow

2015

Journal of Vector Ecology

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“…Vários trabalhos implicam as capivaras como importantes reservatórios para T. evansi (Hoare 1972, Morales et al 1976, Nunes et al 1993, Franke et al 1994, Muñoz & Chavez 2001. Capivaras, e também quatis, geralmente desenvolvem uma forma crônica da doença e podem apresentar infecções subclínicas (Nunes et al 1993, Franke et al 1994, Herrera et al 2001, Muñoz & Chávez 2001. Segundo relatos de pecuaristas pantaneiros, surtos de tripanossomíase em eqüinos geralmente são precedidos pela doença em capivaras (Silva et al 2002).…”

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Surtos de tripanossomíase por Trypanosoma evansi em eqüinos no Rio Grande do Sul: aspectos epidemiológicos, clínicos, hematológicos e patológicos

et al. 2005

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Additionally, around 80 mares were sent to Farm A to be bred. Of those, 66 became ill and 56 died after being returned to their farms of origin. Twenty one horses clinically affected by the disease were observed. Clinical signs included loss of weight (despite voracious appetite), lethargy, incoordination and instability of hindlimbs, atrophy of the large muscles of the hindlimbs, muscle weakness and paleness of mucosae. Specimens of T. evansi were detected in the blood drawn from four affected horses. Normocytic normochromic anemia with PCVs ranging from 15 to 31%, leucocytosis due to lymphocytosis associated to large atypical lymphocytes was observed in several affected horses. High levels of antibodies against T. evansi were detected in the serum of six horses from Farm A. Eight horses presented encephalic neurological signs such as circling, ataxia, blindness, excitation, falls, listlessness, proprioception deficits and head tilt. One horse assumed a "dogseating position". Necropsy findings included muscle atrophy, enlargement and lymphoid hyperplasia of the spleen and lymphnodes, edema and softening of the white and grey matter of the brain. Histologically, an overwhelming necrotizing panencephalitis was observed in the seven horses with encephalic signs. This panencephalitis was characterized by marked edema, demyelination and necrosis and perivascular infiltrates of 6-10 layers of lymphocytes and plasm cells affecting both the white and gray matter. Several plasm cells in the inflammatory infiltrate contained numerous eosinophilic globules in their cytoplasm (Mott cells). Similar histological lesions were observed in the spinal cord of the horse with the "dog-seating position". The brains of five horses with the encephalic signs were submitted to immunohistochemistry stain by the streptavidinbiotin technique. In all of those five brains moderate to abundant specimens of T. evansi in the perivascular spaces and neuropile were marked by the specific antibody. Epidemiological, clinical, hematological, and pathological aspects of equine trypanosomiasis caused by T. evansi are discussed.

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“…This animal either in wild environments or in captivity is regarded as an important reservoir for the outspreading of wild zoonoses induced by acari, bacteria, helminths, protozoans, and viruses (Munoz & Chaves 2001, Figueiredo et al 1999, Ito et al 1998, Sinkoc 1997, Arias et al 1997, Lemos et al 1996, Casas et al 1995, Franke et al 1994, Lombardero et al 1983.…”

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Pathology and first report of natural infections of the eye trematode Philophthalmus lachrymosus Braun, 1902 (Digenea, Philophthalmidae) in a non-human mammalian host

Pinto

Santos

Tortelly

et al. 2005

Mem. Inst. Oswaldo Cruz

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Trypanosoma evansi isolated from capybara (Hidrochaeris hidrochaeris)

Cited by 18 publications

References 5 publications

Seasonal patterns of horse fly richness and abundance in the Pampa biome of southern Brazil

Seasonal patterns of horse fly richness and abundance in the Pampa biome of southern Brazil

Surtos de tripanossomíase por Trypanosoma evansi em eqüinos no Rio Grande do Sul: aspectos epidemiológicos, clínicos, hematológicos e patológicos

Pathology and first report of natural infections of the eye trematode Philophthalmus lachrymosus Braun, 1902 (Digenea, Philophthalmidae) in a non-human mammalian host

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