Faculdade de Agronomia, Medicina Veterinária e Zootecnia da Universidade Federal de Mato Grosso, Cuiabá, MT, Brazil.
Ticks Tick Borne Dis. 2011 Dec;2(4):213-8. doi: 10.1016/j.ttbdis.2011.09.007. Epub 2011 Oct 24.
Sera of 320 dogs from urban and rural areas of a Pantanal region of Brazil were evaluated for rickettsial (Rickettsia rickettsii, R. parkeri, R. amblyommii, R. rhipicephali, R. felis, and R. bellii) and ehrlichial (Ehrlichia canis) infection by the immunofluorescence assay (IFA). Risk factors for ehrlichiosis or rickettsiosis were also evaluated. Positive reaction against Ehrlichia spp. was detected in 227 (70.9%) dogs, 119 (74.3%) from an urban area and 108 (67.5%) from rural areas (P>0.05). For Rickettsia spp., 152 (47.5%) dogs were positive, 31 (19.3%) from urban and 121 (75.6%) from rural areas (P<0.05). Highest anti-Rickettsia spp. endpoint titers were observed for R. amblyommii, suggesting homologous reactions to this agent or a very closely related organism. While most of the urban dogs were found parasitized by the tick Rhipicephalus sanguineus, infestations on rural dogs were predominated by Amblyomma cajenennse. Rickettsial infection was significantly higher (P<0.05) in rural dogs, in dogs with hunting practice, or in A. cajennense-infested dogs.
对来自巴西潘塔纳尔地区城乡的 320 只狗的血清进行了立克次体（包括 Rickettsia rickettsii、R. parkeri、R. amblyommii、R. rhipicephali、R. felis 和 R. bellii）和埃立克体（Ehrlichia canis）感染的免疫荧光检测（IFA）。还评估了埃立克体病或立克次体病的危险因素。在 227 只（70.9%）狗中检测到对埃立克体属的阳性反应，其中 119 只（74.3%）来自城市地区，108 只（67.5%）来自农村地区（P>0.05）。对于立克次体属，152 只（47.5%）狗呈阳性，其中 31 只（19.3%）来自城市，121 只（75.6%）来自农村（P<0.05）。观察到针对 R. amblyommii 的最高抗立克次体属终点滴度，这表明该因子或非常密切相关的生物体存在同源反应。虽然大多数城市犬被血蜱 Rhipicephalus sanguineus 寄生，但农村犬的感染主要由 Amblyomma cajenennse 引起。农村犬、有狩猎习惯的犬或受 A. cajennense 感染的犬的立克次体感染明显更高（P<0.05）。
