Visco R J, Corwin R M, Selby L A
J Am Vet Med Assoc. 1977 Apr 15;170(8):835-7.
The effects of age, sex, and neutering on the prevalence of canine intestinal parasitism were evaluated by fecal examination of 1,468 pet dogs admitted to the University of Missouri Veterinary Teaching Hospital during 1975. Evidence of hookworm infection was encountered in 35.8% of the dogs examined, whipworms in 18.5%, ascarids in 17.9%, tapeworms in 5.2%, and coccidia in 4.5%. Evidence of intestinal parasitism was not detected in 653 (44.4%) dogs. Whipworm infections were detected less often in young dogs than in older ones, whereas ascarid and coccidial infections were more prevalent in pups that in mature dogs. In dogs more than 6 months old, hookworm infections were the most common parasitism. Tapeworm infections were diagnosed sporadically in all age groups. For most of these parasites, castrated males and spayed females had decreased prevalence of infection, compared with their respective intact counterparts. There were significant (P less than 0.05) differences in the prevalence of both ascarid and hookworm infections between intact and spayed female dogs. Also, there were significant (P less than 0.001) differences between age categories for all parasites observed. Overall, parasitism tended to decrease with age.
通过对1975年入住密苏里大学兽医学院教学医院的1468只宠物狗进行粪便检查，评估了年龄、性别和绝育对犬肠道寄生虫感染率的影响。在接受检查的狗中，35.8%有钩虫感染迹象，18.5%有鞭虫感染迹象，17.9%有蛔虫感染迹象，5.2%有绦虫感染迹象，4.5%有球虫感染迹象。653只（44.4%）狗未检测到肠道寄生虫感染迹象。幼犬感染鞭虫的频率低于成年犬，而蛔虫和球虫感染在幼犬中比成年犬更普遍。在6个月以上的狗中，钩虫感染是最常见的寄生虫感染。绦虫感染在所有年龄组中均有零星诊断。对于大多数这些寄生虫，去势雄犬和绝育雌犬的感染率低于各自未绝育的同类犬。未绝育雌犬和绝育雌犬的蛔虫和钩虫感染率存在显著（P<0.05）差异。此外，所有观察到的寄生虫在不同年龄组之间也存在显著（P<0.001）差异。总体而言，寄生虫感染率往往随年龄增长而降低。
