In 2000, the Guatemalan Ministry of Health initiated a Chagas disease program to control Rhodnius prolixus and Triatoma dimidiata by periodic house spraying with pyrethroid insecticides to characterize infestation patterns and analyze the contribution of programmatic practices to these patterns. Spatial infestation patterns at three time points were identified using the Getis-Ord Gi*(d) test. Logistic regression was used to assess predictors of reinfestation after pyrethroid insecticide administration. Spatial analysis showed high and low clusters of infestation at three time points. After two rounds of spray, 178 communities persistently fell in high infestation clusters. A time lapse between rounds of vector control greater than 6 months was associated with 1.54 (95% confidence interval = 1.07–2.23) times increased odds of reinfestation after first spray, whereas a time lapse of greater than 1 year was associated with 2.66 (95% confidence interval = 1.85–3.83) times increased odds of reinfestation after first spray compared with localities where the time lapse was less than 180 days. The time lapse between rounds of vector control should remain under 1 year. Spatial analysis can guide targeted vector control efforts by enabling tracking of reinfestation hotspots and improved targeting of resources.
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机译:2000年,危地马拉卫生部发起了一项查加斯病计划,通过定期向室内喷洒拟除虫菊酯类杀虫剂来控制罗氏梭状芽胞杆菌和三角藻(Triatoma dimidiata),以表征侵染模式并分析编程实践对这些模式的贡献。使用Getis-Ord Gi *(d)检验确定了三个时间点的空间侵扰模式。使用Logistic回归评估施用拟除虫菊酯杀虫剂后再次感染的预测因子。空间分析表明,在三个时间点上有高和低的侵扰群。经过两轮喷雾后,178个社区持续陷于高度侵扰群。两次媒介控制之间的间隔时间大于6个月,第一次喷洒后再感染几率增加1.54倍(95%置信区间= 1.07–2.23),而间隔时间大于1年则与2.66相关(95)相较于时间间隔少于180天的地区,首次置信后再感染几率的百分比置信区间= 1.85–3.83)倍。两轮媒介控制之间的时间间隔应保持在1年以下。空间分析可以通过跟踪重新侵染的热点并改善资源定位来指导有针对性的媒介控制工作。
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