智利野生若虫和家栖成虫感染克氏锥虫基因型的差异模式。
Differential pattern of infection of sylvatic nymphs and domiciliary adults of Triatoma infestans with Trypanosoma cruzi genotypes in Chile.
机构信息
Departamento de Ciencias Biológicas Animales, Facultad de Ciencias Veterinarias y Pecuarias, Universidad de Chile, Santiago, Chile.
出版信息
Am J Trop Med Hyg. 2012 Sep;87(3):473-80. doi: 10.4269/ajtmh.2012.11-0237. Epub 2012 Jul 16.
Abstract
In Chile, the main vector of Chagas disease, Triatoma infestans, is under control after insecticide spraying. However, it has been found colonizing wild habitats. This study evaluated Trypanosoma cruzi infection of sylvatic and domiciliary T. infestans and identified their parasite genotypes. The sample studied was composed mainly of T. infestans sylvatic nymphs and domiciliary adults from a semi-urban area with human dwellings under vector control surveillance. Results showed prevalences of 57.7% in nymphs and 68.6% in adults. Hybridization tests showed a major T. cruzi lineage (TcI) circulating in sylvatic (93.3%) and domiciliary (100%) T. infestans. TcII, TcV, and TcVI were also detected, mainly in nymphs, suggesting differential adaptation of T. cruzi lineages among instars. We also discuss the origin of domiciliary individuals of T. infestans and the risk of human infection by triatomines of sylvatic foci that invade houses despite vector control programs.
摘要
在智利，经过杀虫剂喷洒，主要的查加斯病传播媒介——三带喙库蚊已得到控制。然而，人们发现它已在野外栖息地中定殖。本研究评估了野生和家养三带喙库蚊的克氏锥虫感染情况，并鉴定了它们的寄生虫基因型。研究样本主要由接受媒介控制监测的半城市地区的野生三带喙库蚊若虫和家栖成蚊组成。结果显示，若虫的感染率为 57.7%，成蚊的感染率为 68.6%。杂交试验显示，主要的克氏锥虫谱系（TcI）在野生（93.3%）和家栖（100%）三带喙库蚊中传播。还检测到了 TcII、TcV 和 TcVI，主要在若虫中，这表明克氏锥虫谱系在不同龄期中存在差异适应。我们还讨论了家栖三带喙库蚊的起源以及尽管有媒介控制计划，但入侵房屋的野生栖息地的三带喙库蚊感染人类的风险。
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