National Veterinary Institute, Department for Health Surveillance, Oslo, Norway.
Epidemiol Infect. 2010 Sep;138(9):1336-45. doi: 10.1017/S0950268810000051. Epub 2010 Jan 29.
This study was performed to investigate space-time patterns of Campylobacter spp. colonization in broiler flocks in Norway. Data on the Campylobacter spp. status at the time of slaughter of 16 054 broiler flocks from 580 farms between 2002 and 2006 was included in the study. Spatial relative risk maps together with maps of space-time clustering were generated, the latter by using spatial scan statistics. These maps identified the same areas almost every year where there was a higher risk for a broiler flock to test positive for Campylobacter spp. during the summer months. A modified K-function analysis showed significant clustering at distances between 2.5 and 4 km within different years. The identification of geographical areas with higher risk for Campylobacter spp. colonization in broilers indicates that there are risk factors associated with Campylobacter spp. colonization in broiler flocks varying with region and time, e.g. climate, landscape or geography. These need to be further explored. The results also showed clustering at shorter distances indicating that there are risk factors for Campylobacter spp. acting in a more narrow scale as well.
本研究旨在调查挪威肉鸡群中弯曲杆菌属定植的时空模式。该研究纳入了 2002 年至 2006 年间 580 个农场的 16054 个肉鸡群在屠宰时弯曲杆菌属状况的数据。生成了时空聚类的空间相对风险图和空间扫描统计数据的时空聚类图。这些地图每年几乎都能识别出夏季肉鸡群弯曲杆菌属检测呈阳性的高风险区域。改良的 K 函数分析显示，不同年份之间在 2.5 至 4 公里的距离上存在显著的聚类。在肉鸡弯曲杆菌属定植风险较高的地理区域的确定表明，与地区和时间相关的弯曲杆菌属定植的风险因素在不断变化，例如气候、景观或地理。这些因素需要进一步研究。结果还表明，在较短的距离上存在聚类，这表明弯曲杆菌属的风险因素也在更窄的范围内起作用。
