Eidson Millicent, Schmit Kate, Hagiwara Yoichiro, Anand Madhu, Backenson P Bryon, Gotham Ivan, Kramer Laura
New York State Department of Health, Albany, New York, USA.
Emerg Infect Dis. 2005 Sep;11(9):1370-5. doi: 10.3201/eid1109.040712.
New York State used the health commerce system to monitor the number of West Nile virus (WNV) human disease cases and the density of dead crows. In each year from 2001 to 2003 and for the 3 years combined, persons living in New York counties (excluding New York City) with elevated weekly dead crow densities (above a threshold value of 0.1 dead crows per square mile) had higher risk (2.0-8.6 times) for disease caused by WNV within the next 2 weeks than residents of counties reporting fewer dead crows per square mile. This type of index can offer a real-time, relatively inexpensive window into viral activity in time for prevention and control. Changes in reporting, bird populations, and immunity may require that thresholds other than 0.1 be used in later years or in other areas.
纽约州利用健康商业系统监测西尼罗河病毒（WNV）人类疾病病例数量和死乌鸦密度。在2001年至2003年的每一年以及这三年的综合数据中，居住在纽约州各县（不包括纽约市）且每周死乌鸦密度升高（高于每平方英里0.1只死乌鸦的阈值）的人，在接下来的2周内感染WNV导致疾病的风险比每平方英里死乌鸦报告数量较少的县的居民高（2.0至8.6倍）。这种类型的指数可以及时提供一个实时的、相对廉价的了解病毒活动的窗口，以便进行预防和控制。报告方式、鸟类数量和免疫力的变化可能要求在未来几年或其他地区使用不同于0.1的阈值。
