Prevalence of newcastle disease virus in broiler chickens (gallus gallus) in Brazil
Braz. j. microbiol
; 41(2): 349-357, Apr.-June 2010. tab, ilus
Article
em En
| LILACS
| ID: lil-545341
Biblioteca responsável:
BR32.1
ABSTRACT
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 percent, and the isolation percentage by flock varied from 1.0 to 7.6 percent, and by region from 6.5 to 58.4 percent. Higher isolation rates (74.3-83.3 percent) were obtained after three passages in embryonated chicken eggs. All isolates preliminarily identified as NDV were characterized as nonpathogenic strains, as their Intracerebral Pathogenicity Index (ICPI) was below 0.7. Based on results of this study, Brazil can claim a virulent NDV-free status for commercial flocks.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
LILACS
Assunto principal:
Aves Domésticas
/
Reações Biológicas
/
Avulavirus
/
Infecções por Avulavirus
Tipo de estudo:
Prevalence_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Animals
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Braz. j. microbiol
Assunto da revista:
MICROBIOLOGIA
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Brasil