Information about human tick bites in Brazil is mostly anecdotal. Published information is typically restricted to single tick infestation episodes and does not address human exposure occurring on a daily basis in natural, rural, or green urban areas. We present a comprehensive 2-yr study on human parasitism during a broad survey on ticks within a Brazilian savannah reserve. Overall, 439 tick bites were recorded from the following species: Amblyomma sculptum (n = 331 bites), Amblyomma parvum (n = 64), Amblyomma auricularium (n = 3), Rhipicephalus microplus (n = 2), Dermacentor nitens (n = 1) and 38 Amblyomma spp. ticks. Nymphs accounted for most tick bites (n = 292, 66.5 % of all bites) and these were overwhelmingly A. sculptum (92.8 % of nymphal bites). The main adult tick biting humans was A. parvum (n = 61, 50 % of all adult tick bites) followed closely by A. sculptum (n = 58, 47.5 % of all adult tick bites). Winter was the season with the highest percentage of tick bites (39.7 % of all bites), followed by spring (32.4 %); summer (18.9 %) and autumn (9 %). Amblyomma sculptum adult bites peaked in summer whereas nymphal bites occurred primarily in winter and spring. Amblyomma parvum adult bites peaked in spring and summer. The most common tick attachment sites included the waist, legs and belly, but A. parvum adults were recorded from the head of humans as well. A noteworthy observation was the lack of human parasitism by Amblyomma triste, the third most prevalent species in the environment. This tick species is a frequent human biter in both Uruguay and Argentina where it transmits a pathogen, Rickettsia parkeri, to humans.

关于巴西的人类tick虫叮咬的信息大多是轶事。已发布的信息通常仅限于单虱侵扰事件，而不能解决在自然，农村或绿色城市地区每天发生的人体暴露问题。在对巴西大草原保护区内的壁虱进行广泛调查的过程中，我们将对人类寄生虫进行为期两年的全面研究。总共记录到以下物种的439叮咬叮咬：Amblyomma sculptum（n = 331 bites），Amblyomma parvum（n = 64），Amblyomma auricularium（n = 3），Rhipicephalus microplus（n = 2），Dermacentor nitens（n = 1）和38个Amblyommaspp。滴答声。若虫占大多数tick叮咬（n = 292，占所有叮咬的66.5％），其中绝大多数是假单胞菌（9.8％的若虫叮咬）。主要的成年tick咬人是小曲霉（n = 61，占所有成年tick咬的50％），紧随其后的是草假单胞菌（n = 58，占所有成年tick咬的47.5％）。冬季是tick虫叮咬百分比最高的季节（占所有叮咬的39.7％），其次是春季（32.4％）；夏天（18.9％）和秋天（9％）。浮雕adult成虫叮咬在夏季达到高峰，而若虫叮咬主要发生在冬季和春季。轻度弱视成虫叮咬在春季和夏季达到高峰。最常见的壁虱附着部位包括腰部，腿部和腹部，但是还从人的头上记录了小菜曲霉成虫。一个值得注意的观察是，环境中第三大流行物种Amblyomma triste缺乏人类寄生虫。这种壁虱种类在乌拉圭和阿根廷都是常见的人类咬人，它在人类中传播病原体立克次氏体立克次体。