Aspectos do parasitismo de Plasmodium (Novyella) juxtanucleare Versiani & Gomes, 1941 em Gallus gallus L., 1758 em criação rústica no município de Santa Bárbara do Tugúrio - MG

Abstract

Com o objetivo de se ampliar o conhecimento sobre a ocorrência do parasitismo por Plasmodium (Novyella) juxtanucleare Versiani e Gomes, 1941, em aves da espécie Gallus gal/us L. 1758 no estado de Minas Gerais, realizou-se um levantamento de prevalência no município de Santa Bárbara do Tugúrio (21 2 15'12"S, 43 2 27'16"W). Foram examinados esfregaços sangüíneos, corados pelo Giemsa e observados em microscopia fotônica em imersão, de 30 aves mestiças, adultas, de criação rústica, mantidas extensivamente, com peso médio de 2, 18kg ± 0,34, sendo 29 fêmeas. As formas eritrocitárias foram registradas e quantificadas pela observação de 50 campos microscópicos assinalando-se o número de eritrócitos parasitados. A prevalência foi de 100% e a intensidade média de 7,93 parasitos por lâmina nos campos examinados. Observaram-se em 33,3% dos esfregaços de um a cinco parasitos, 40% de seis a 1 O e 26,6% acima de 1 O. Não foram observados casos de poliparasitismo.

High prevalence of Plasmodium infection in fighting cocks in Thailand determined with a molecular method

“…In studies conducted overseas, the molecular prevalence of plasmodiasis in avian hosts varied from 5.9% in injured wild birds in Tokyo, Japan and the city’s environs ( 16 ), through 12.1% in birds in Iran ( 23 ), 13.5% in penguins undergoing rehabilitation in Brazil ( 46 ), 18% in domestic chickens ( Gallus gallus domesticus ) in Baghdad, Iraq ( 14 ) and 20% in wild birds on Tsushima Island in Japan ( 39 ) to 100% in chickens in some areas of Brazil ( 32 ). Differences in prevalence may be explained due to the species or strain of the vector and the avian host ( 38 ), geographical and climatic conditions which affect the distribution and spread of vectors ( 3 ), the avian health management programme including vector prevention and control strategy in a given country, and also the sensitivity and specificity of the specific primers used for molecular detection ( 33 ).…”

A new pathogen spillover from domestic to wild animals: Plasmodium juxtanucleare infects free-living passerines in Brazil

“…Plasmodium juxtanucleare was described for the first time in 1941 in Brazil (Versiani and Gomes, 1941) and since then it has been reported in Asia (Bennett and Warren, 1966; Chen et al , 2015) and in many parts of the globe, including Africa (Earle et al , 1991; Poulsen et al , 2000) and other countries in the American continent, such as Mexico and Uruguay (Garnham, 1966). This parasite is widely distributed in Brazil, and prevalence varies from 4 to 100% in backyard chicken (Paraense, 1949; Krettli, 1972; Mota et al , 2000; Prezoto et al , 2001). The chronic phase of the infection is usually benign (Bennett and Warren, 1966; Silveira et al , 2009), but anaemia, prostration and clinical signs such as incoordination and paralysis due to neurological lesions are common at the acute phase of infection, with some cases evolving to death under experimental conditions (Krettli, 1972; Silveira et al , 2013).…”