Tustin Aaron W, Castillo-Neyra Ricardo, Tamayo Laura D, Salazar Renzo, Borini-Mayorí Katty, Levy Michael Z
Department of Environmental Health Sciences, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, USA.
Zoonotic Disease Research Lab, One Health Unit, School of Public Health and Administration, Universidad Peruana Cayetano Heredia, Lima, Lima Province 15102, Peru.
Trop Med Infect Dis. 2020 Jun 1;5(2):87. doi: 10.3390/tropicalmed5020087.
Blood-sucking triatomine bugs transmit the protozoan parasite , the etiologic agent of Chagas disease. We measured the prevalence of infection in 58,519 captured in residences in and near Arequipa, Peru. Among bugs from infected colonies, prevalence increased with stage from 12% in second instars to 36% in adults. Regression models demonstrated that the probability of parasite acquisition was roughly the same for each developmental stage. Prevalence increased by 5.9% with each additional stage. We postulate that the probability of acquiring the parasite may be related to the number of feeding events. Transmission of the parasite does not appear to be correlated with the amount of blood ingested during feeding. Similarly, other hypothesized transmission routes such as coprophagy fail to explain the observed pattern of prevalence. Our results could have implications for the feasibility of late-acting control strategies that preferentially kill older insects.
吸血锥蝽传播原生动物寄生虫，即恰加斯病的病原体。我们测量了在秘鲁阿雷基帕及其附近地区住宅中捕获的58519只锥蝽的感染率。在来自受感染群体的锥蝽中，感染率随虫龄增加，从二龄若虫的12%增至成虫的36%。回归模型表明，每个发育阶段获取寄生虫的概率大致相同。每增加一个虫龄阶段，感染率增加5.9%。我们推测获取寄生虫的概率可能与取食次数有关。寄生虫的传播似乎与取食时摄入的血量无关。同样，其他假设的传播途径，如食粪行为，也无法解释观察到的感染率模式。我们的结果可能对优先杀死老龄昆虫的后期控制策略的可行性具有启示意义。
