Ponce-Macotela Martha, Peralta-Abarca Gustavo E, Martínez-Gordillo Mario N
Laboratorio de Parasitología Experimental, Instituto Nacional de Pediatría, Insurgentes Sur No. 3700-C, C.P. 04530 México D.F., México.
Vet Parasitol. 2005 Jul 15;131(1-2):1-4. doi: 10.1016/j.vetpar.2005.03.027.
The protozoan Giardia intestinalis is a mammalian-infecting parasite. It produces diarrhoea and malabsorption in its hosts. There is growing evidence that dogs could be reservoirs and play an important role in transmission. In Mexico, there are few data on the frequency of G. intestinalis. Therefore, we studied the small intestine of stray dogs, euthanazed at the "Culhuacan" Control Canine Centre, towards the end of 1997 and during the summer of 1998. We microscopically analysed intestinal contents and mucus samples taken every 3cm. During the cold season (winter), parasites were not found in 38/100 dogs, in contrast to 8/100 through the warm season. We found that 42/100 in winter and 51/100 in summer harboured G. intestinalis. To our knowledge, these G. intestinalis frequencies are the highest found in adult dogs worldwide. The results showed a rise in Ancylostoma spp. from 23/100 to 67/100 during the cold and warm seasons. Toxocara canis frequencies varied between 12/100 and 18/100, respectively. The data suggest that the probability of infection is higher during the hottest months compared to the coldest months of the year. Both puppies and adult dogs are highly infected. Dogs are reservoirs for zoonotic parasites; for this reason, it is imperative for humans to avoid fecal contamination in streets, public gardens and parks.
原生动物贾第虫是一种感染哺乳动物的寄生虫。它会导致宿主腹泻和吸收不良。越来越多的证据表明，狗可能是该寄生虫的宿主，并在传播中起重要作用。在墨西哥，关于贾第虫感染频率的数据很少。因此，我们研究了1997年底和1998年夏天在“库尔瓦坎”犬类控制中心安乐死的流浪狗的小肠。我们对每隔3厘米采集的肠道内容物和黏液样本进行了显微镜分析。在寒冷季节（冬季），100只狗中有38只未发现寄生虫，而在温暖季节这一比例为8/100。我们发现，冬季100只中有42只、夏季100只中有51只感染了贾第虫。据我们所知，这些贾第虫感染频率是全球成年犬中发现的最高频率。结果显示，钩虫属在寒冷和温暖季节的感染率从23/100上升到67/100。犬弓首蛔虫的感染率分别在12/100和18/100之间变化。数据表明，与一年中最寒冷的月份相比，在最热的月份感染的可能性更高。幼犬和成年犬都受到高度感染。狗是人畜共患寄生虫的宿主；因此，人类必须避免街道、公共花园和公园中的粪便污染。
