Newcastle disease in white Pekin ducks: response to experimental vaccination and challenge

Revista Brasileira de Ciência Avícola

M Nishizawa²  Ac Paulillo²  Lso Nakaghi²  Ad Nunes²  Jm Campioni²  L Doretto Júnior¹ 

[1] ,Universidade Estadual Paulista Faculdade de Ciências Agrárias e VeterináriasSP ,Brasil

关键词: Anas platyrhynchos;    NDV carrier;    Newcastle disease;    Pekin duck;    vaccination;   

DOI  :  10.1590/S1516-635X2007000200008

来源: SciELO

【 摘 要 】

A total of 120 Pekin ducks were distributed at random into four experimental groups, vaccinated or not against Newcastle disease (ND): G1 (Ulster 2C strain), G2 (B1 strain), G3 (LaSota strain), and G4 (nonvaccinated group). At 60 days of age, all groups were challenged with a pathogenic ND virus (NDV) suspension, and a group of specific pathogen free (SPF) chicks (G5) was also inoculated. Cloacal and tracheal swabs from all birds were collected after six, 14, 20, and 30 days post-challenge for virus isolation. NDV was isolated in 100% of SPF chicks. Pekin ducks from all groups, vaccinated or not, did not show any ND clinical signs, demonstrating that these birds are not susceptible to ND clinical disease. In the control group (G4), the virus was isolated 20 to 30 days after challenge, suggesting their possible NDV carrier state. In the vaccinated groups, no virus was isolated. This demonstrates that vaccination of white Pekin ducks against NDV is important to reduce NDV shedding in the field.

【 授权许可】

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