Emerg Infect Dis. 2020 Apr;26(4):648-657. doi: 10.3201/eid2604.191382.
Tickborne diseases are rare in Washington, USA, and the ecology of these pathogens is poorly understood. We integrated surveillance data from humans and ticks to better describe their epidemiology and ecology. During 2011-2016, a total of 202 tickborne disease cases were reported in Washington residents. Of these, 68 (34%) were autochthonous, including cases of Lyme disease, Rocky Mountain spotted fever, tickborne relapsing fever, and tularemia. During May 2011-December 2016, we collected 977 host-seeking ticks, including Ixodes pacificus, I. angustus, I. spinipalpis, I. auritulus, Dermacentor andersoni, and D. variabilis ticks. The prevalence of Borrelia burgdorferi sensu stricto in I. pacificus ticks was 4.0%; of B. burgdorferi sensu lato, 3.8%; of B. miyamotoi, 4.4%; and of Anaplasma phagocytophilum, 1.9%. We did not detect Rickettsia rickettsii in either Dermacentor species. Case-patient histories and detection of pathogens in field-collected ticks indicate that several tickborne pathogens are endemic to Washington.
在美国华盛顿，蜱传疾病较为罕见，这些病原体的生态学特性也知之甚少。我们整合了来自人类和蜱的监测数据，以更好地描述其流行病学和生态学特征。2011 年至 2016 年间，共有 202 例华盛顿居民的蜱传疾病报告。其中 68 例（34%）为本地感染，包括莱姆病、落基山斑点热、蜱传回归热和兔热病。2011 年 5 月至 2016 年 12 月，我们收集了 977 只宿主寻求的蜱，包括太平洋硬蜱、安氏硬蜱、扇头蜱、太平洋革蜱、西部肩突硬蜱和全沟硬蜱。太平洋硬蜱中伯氏疏螺旋体的检出率为 4.0%，莱姆病螺旋体的检出率为 3.8%，无形体的检出率为 4.4%，嗜吞噬细胞无形体的检出率为 1.9%。我们在两种肩突硬蜱中均未检测到立氏立克次体。病例患者的病史和现场采集的蜱中病原体的检测结果表明，华盛顿有几种蜱传病原体呈地方性流行。
