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A survey for maintenance of virulent newcastle disease virus-free area in poultry production in Brazil
Provedor de dados: 58
Autores: Orsi,M.A; Doretto Jr,L; Camillo,S.C.A; Reischak,D; Ribeiro,S.A.M; Ramazzoti,A; Mendonça,A.O; Spilki,F.R; Buzinaro,M.G; Ferreira,H.L; Arns,C.W.
In 2003, Brazil was recognized as a pathogenic Newcastle Disease Virus (NDV) strain-free country for commercial poultry. This research was conducted in Brazil between December 2003 and March 2005 to verify the maintenance of this virulent NDV-free status. Serum samples from 5,455 flocks for commercial poultry farms were collected, comprising 81,825 broiler chickens. The farms were located in nine states of the country, grouped in three geographic regions. Serological evidence of NDV infection was detected in 28.8% of the surveyed farms. However, all fifteen viruses isolated and identified as Newcastle Disease Virus (NDV) were characterized as nonpathogenic strains, based on the Intracerebral Pathogenicity Index. These results showed that Brazil preserves...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Newcastle Disease Virus; Pathogenicity; Poultry; Biological characterization.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000200017

Prevalence of newcastle disease virus in broiler chickens (Gallus gallus) in Brazil
Provedor de dados: 58
Autores: Orsi,M.A; Doretto Jr,L; Camillo,S.C.A; Reischak,D; Ribeiro,S.A.M; Ramazzoti,A; Mendonça,A.O; Spilki,F.R; Buzinaro,M.G; Ferreira,H.L; Arns,C.W.
This study was carried out during 2002/2003, aiming to determine the prevalence of virulent Newcastle disease virus strains (NDV) in Brazilian commercial poultry farms. Clinical samples were obtained from the Southeastern, Southern and Central-Western regions, which comprise the main area of the Brazilian poultry production. Serum samples and tracheal and cloacal swabs of 23,745 broiler chickens from 1,583 flocks, including both vaccinated chickens and those with no vaccination information, were tested for NDV using a diagnostic ELISA kit. The seropositivity was 39.1%, and the isolation percentage by flock varied from 1.0 to 7.6%, and by region from 6.5 to 58.4%. Higher isolation rates (74.3-83.3%) were obtained after three passages in embryonated chicken...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Newcastle Disease Virus; NDV-free status; Pathogenicity; Broiler chickens; Biological characterization.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000200014