Gasmi S, Ogden N H, Lindsay L R, Burns S, Fleming S, Badcock J, Hanan S, Gaulin C, Leblanc M A, Russell C, Nelder M, Hobbs L, Graham-Derham S, Lachance L, Scott A N, Galanis E, Koffi J K
Centre for Food-borne, Environmental and Zoonotic Infectious Diseases, Public Health Agency of Canada, Saint-Hyacinthe, QC.
Public Health Risk Sciences Division, National Microbiology Laboratory, Public Health Agency of Canada, Saint-Hyacinthe, QC.
Can Commun Dis Rep. 2017 Oct 5;43(10):194-199. doi: 10.14745/ccdr.v43i10a01.
To summarize seven years of surveillance data for Lyme disease cases reported in Canada from 2009 to 2015.
We describe the incidence over time, seasonal and geographic distribution, demographic and clinical characteristics of reported Lyme disease cases. Logistic regression was used to explore differences between age groups, sex and year to better understand potential demographic risk factors for the occurrence of Lyme disease.
The number of reported Lyme disease cases increased more than six-fold, from 144 in 2009 to 917 in 2015, mainly due to an increase in infections acquired in Canada. Most locally acquired cases were reported between May and November. An increase in incidence of Lyme disease was observed in provinces from Manitoba eastwards. This is consistent with our knowledge of range expansion of the tick vectors in this region. In the western provinces the incidence has remained low and stable. All cases reported by Alberta, Saskatchewan and Newfoundland and Labrador were acquired outside of the province, either elsewhere in Canada or abroad. There was a bimodal distribution for Lyme disease by age with peaks at 5-9 and 45-74 years of age. The most common presenting symptom was a single erythema migrans rash (74.2%) and arthritis (35.7%). Variations in the frequency of reported clinical manifestations were observed among age groups and years of study.
Lyme disease incidence continues to increase in Canada as does the geographic range of ticks that carry the Lyme disease bacteria. Ongoing surveillance, preventive strategies as well as early disease recognition and treatment will continue to minimize the impact of Lyme disease in Canada.
总结2009年至2015年加拿大报告的莱姆病病例的七年监测数据。
我们描述了报告的莱姆病病例随时间的发病率、季节性和地理分布、人口统计学和临床特征。使用逻辑回归来探讨年龄组、性别和年份之间的差异，以更好地了解莱姆病发生的潜在人口统计学风险因素。
报告的莱姆病病例数增加了六倍多，从2009年的144例增至2015年的917例，主要原因是在加拿大感染的病例增加。大多数本地感染病例报告于5月至11月之间。从马尼托巴省向东的各省观察到莱姆病发病率上升。这与我们对该地区蜱虫媒介范围扩大的了解一致。在西部省份，发病率一直较低且稳定。艾伯塔省、萨斯喀彻温省以及纽芬兰和拉布拉多省报告的所有病例均在省外感染，要么在加拿大其他地方，要么在国外。莱姆病的年龄分布呈双峰模式，高峰出现在5至9岁和45至74岁。最常见的症状是单一的游走性红斑皮疹（74.2%）和关节炎（35.7%）。在不同年龄组和研究年份中观察到报告的临床表现频率存在差异。
加拿大莱姆病的发病率以及携带莱姆病菌的蜱虫的地理范围都在持续增加。持续的监测、预防策略以及疾病的早期识别和治疗将继续最大限度地减少莱姆病对加拿大的影响。
