Busani Luca, Valsecchi Maria Grazia, Rossi Emanuela, Toson Marica, Ferrè Nicola, Pozza Manuela Dalla, Marangon Stefano
Istituto Zooprofilattico delle Venezie, viale dell'Università 10, 35020 Legnaro, Padova, Italy.
Vet J. 2009 Aug;181(2):171-7. doi: 10.1016/j.tvjl.2008.02.013. Epub 2008 Aug 5.
In 1999-2000, Italian poultry production was disrupted by an H7N1 virus subtype epidemic of highly pathogenic avian influenza (HPAI). The objectives of the present study were to identify risk factors for infection on poultry farms located in regions that had the highest number of outbreaks (Veneto and Lombardia) and the impact of pre-emptive culling as a complementary measure for eradicating infection. A Cox regression model that included spatial factors, such as the G index, was used. The results confirmed the relationship between risk of infection and poultry species, production type and size of farms. The effectiveness of pre-emptive culling was confirmed. An increased risk of infection was observed for poultry farms located near an infected farm and those at altitudes less than 150m above sea level. The measures for the control and eradication of AI virus infection need to consider species differences in susceptibility, the types of production and the density of poultry farms in the affected areas.
1999年至2000年，意大利家禽生产因高致病性禽流感（HPAI）H7N1病毒亚型疫情而中断。本研究的目的是确定疫情爆发数量最多的地区（威尼托和伦巴第）家禽养殖场的感染风险因素，以及作为根除感染补充措施的先发制扑杀的影响。使用了一个包含空间因素（如G指数）的Cox回归模型。结果证实感染风险与家禽种类、生产类型和养殖场规模之间存在关联。先发制扑杀的有效性得到证实。观察到位于受感染养殖场附近以及海拔低于海平面150米的家禽养殖场感染风险增加。控制和根除禽流感病毒感染的措施需要考虑易感性的物种差异、生产类型以及受影响地区家禽养殖场的密度。
