Gürtler R E, Cécere M C, Petersen R M, Rubel D N, Schweigmann N J
Laboratorio de Ecología General, Universidad de Buenos Aires, Argentina.
Trans R Soc Trop Med Hyg. 1993 Jan-Feb;87(1):12-5. doi: 10.1016/0035-9203(93)90400-k.
The association between Trypanosoma cruzi parasitaemia in dogs and cats and Tryp. cruzi infection rates in domestic Triatoma infestans was studied in a cross-sectional survey of 31 houses (89%) in the rural villages of Trinidad and Mercedes, north-west Argentina, where no spraying of insecticides had ever been done. Similar prevalence rates of parasitaemia, determined by xenodiagnosis, were recorded among 68 dogs (41.2%) and 28 cats (39.3%). Bug infection rates were significantly associated with the presence of infected cats (those with positive xenodiagnosis) stratified by the number of infected dogs (relative risk = RR = 1.90; 95% confidence interval = CI = 1.51-2.38), and with the number of infected dogs stratified by the presence of infected cats (RR = 2.71; CI = 1.81-4.07). The percentage of infected bugs in houses with and without children stratified by the presence of infected dogs or cats was not significantly different (RR = 0.69; CI = 0.45-1.05). The combined effect of infected dogs and infected cats on bug infection rates fitted closely with an additive transmission model. Bug infection rates were significantly higher when infected dogs shared the sleeping areas of people than when they did not (RR = 1.79; CI = 1.1-2.91). Our study showed that infected dogs and infected cats increase the risk of domestic transmission of Tryp. cruzi to T. infestans.
在阿根廷西北部特立尼达和梅赛德斯乡村的31所房屋（占89%）中进行了一项横断面调查，研究犬猫的克氏锥虫血症与家栖骚扰锥蝽的克氏锥虫感染率之间的关联，这些村庄从未进行过杀虫剂喷洒。通过异种接种诊断确定，68只犬（41.2%）和28只猫（39.3%）的寄生虫血症患病率相似。按感染犬数量分层时，臭虫感染率与感染猫（异种接种诊断呈阳性的猫）的存在显著相关（相对风险=RR=1.90；95%置信区间=CI=1.51 - 2.38），按感染猫的存在分层时，与感染犬的数量显著相关（RR=2.71；CI=1.81 - 4.07）。按感染犬或猫的存在分层，有儿童和无儿童房屋中感染臭虫的百分比无显著差异（RR=0.69；CI=0.45 - 1.05）。感染犬和感染猫对臭虫感染率的综合影响与相加传播模型密切拟合。当感染犬与人共用睡眠区域时，臭虫感染率显著高于不共用时（RR=1.79；CI=1.1 - 2.91）。我们的研究表明，感染犬和感染猫会增加克氏锥虫在家中传播给骚扰锥蝽的风险。
