Schenone H, Contreras M C, Rojas A, Villarroel F
Departamento de Parasitología, Facultad de Medicina, Universidad de Chile, Santiago, Chile.
Bol Chil Parasitol. 1995 Jan-Jun;50(1-2):42-4.
An analytical study of positive xenodiagnosis (XD), according to age distribution, in people with a positive indirect hemagglutination test (IHAT) for Chagas' disease has been carried out. A total of 1,137 IHAT for Chagas' disease positive persons were submitted to two wooden XD boxes containing 7 Triatoma infestans nymphs III each. The positivity (%) of XD in the different age groups was: 0-9 year-old (60.8), 10-19 (35.8), 20-29 (31.5), 30-39 (28.7), 40-49 (30.0), 50-59 (34.3) and > or = 60 (43.3). The 60.8% positivity of XD in children under 10 years of age is possibly due to the rather recent Trypanosoma cruzi infection in this age group and to diverse immunological mechanisms, which decrease with the age increasing.
针对恰加斯病间接血凝试验（IHAT）呈阳性的人群，根据年龄分布对阳性异种诊断（XD）进行了一项分析研究。共有1137名恰加斯病IHAT呈阳性的人被置于两个木制XD箱中，每个箱子装有7只III期骚扰锥蝽若虫。不同年龄组的XD阳性率（%）分别为：0 - 9岁（60.8）、10 - 19岁（35.8）、20 - 29岁（31.5）、30 - 39岁（28.7）、40 - 49岁（30.0）、50 - 59岁（34.3）以及≥60岁（43.3）。10岁以下儿童中XD阳性率为60.8%，这可能是由于该年龄组近期感染克氏锥虫，以及随着年龄增长而减弱的多种免疫机制所致。
