Data/hora: 06/06/2024 19:14:58

Provedor de dados: 	58	
País: 	Brazil	
Título: 	Mycoplasma synoviae infection on Newcastle disease vaccination of chickens	
Autores: 	Silva,Rita de Cássia Figueira; Nascimento,Elmiro Rosendo do; Pereira,Virgínia Léo de Almeida; Barreto,Maria Lúcia; Nascimento,Maria da Graça Fichel do.	
Data: 	2008-06-01	
Ano: 	2008	
Palavras-chave: 	Vaccine; Serology; Mycoplasma; Newcastle disease.	
Resumo: 	Newcastle disease is characterized by respiratory manifestations in association with nervous and/or digestive symptoms. Its prevention is done by vaccination with live attenuated (lentogenic strains) and/or killed vaccines. The lentogenic strains can lead to strong post-vaccination reaction, principally due to the presence of other pathogenic agents. Among them, Mycoplasma synoviae is worldwide important, mainly in Brazil. The dissemination of this agent in poultry flocks has been achieved due to difficulties in diagnosis and disease reproduction, virulence variations among different M.synoviae strains, and attribution of typical M.synoviae disease manifestation to other disease agents. This experimental study in SPF chicks (Gallus gallus), previously infected by M.synoviae and thereafter vaccinated against Newcastle disease, was done with the objective of evaluating M.synoviae pathogenicity through assessment of post-vaccinal respiratory reactions and serologic responses to Newcastle disease virus vaccine in the absence of environmental factors. A total of 86 three days old chicks were used, being 57 infected by eye and nostril drop, with chicken activated M. synoviae strain WVU 1853. Seven days later, 21 mycoplasma infected birds plus 29 not mycoplasma infected ones were vaccinated against Newcastle disease. As results, the not infected and vaccinated birds yielded, significantly, higher and longer lasting serologic responses to Newcastle disease vaccine virus than those infected and vaccinated. Similarly, the infected and vaccinated birds yielded lower serologic reactions to M.synoviae than those only mycoplasma infected. No post-vaccinal respiratory reaction was observed in the vaccinated birds.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000200033	
Editor: 	Sociedade Brasileira de Microbiologia	
Relação: 	10.1590/S1517-83822008000200033	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Microbiology  v.39 n.2 2008	
Fonte: 	info:eu-repo/semantics/openAccess