Slocombe J O, Villeneuve A
Can Vet J. 1993 Oct;34(10):630-3.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium.
1991年11月下旬，向加拿大的1883家诊所发送了一份调查问卷，以评估1991年犬类体内犬恶丝虫的感染情况，回复率为60.0%。共有344,031只犬接受了心丝虫检测，其中627只被检测出感染，心丝虫感染率为0.18%。安大略省有417只感染心丝虫的犬，马尼托巴省有116只，魁北克省有38只，不列颠哥伦比亚省有53只，艾伯塔省有3只，新斯科舍省有1只。在不列颠哥伦比亚省，除1只外，所有感染犬均来自奥卡纳根山谷，自1991年起，该地区成为加拿大新的感染热点地区。大多数感染心丝虫的犬在1990年未接受预防用药，在接受检测且未采取防护措施的犬中，感染率为0.59%。在流行地区，该感染率要高得多。主要饲养在农村户外、年龄超过三岁的宠物犬最常被感染。有1只猫被诊断感染犬恶丝虫，33只犬感染隐匿双瓣线虫。
