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a dog naturally infected with rickettsia akari in yucatan, méxico.rickettsia akari is the causative agent of rickettsialpox, a primarily urban mite-borne rickettsiosis that is encountered in the united states and in a few countries around the world. its vector is the mite liponyssoides sanguineus, which is found on rats and mice, which serve as reservoirs for the disease. in this work we report a severe animal case of r. akari infection with two unusual features: r. akari was found in a dog, and its potential vector was a tick.200919492943
first report of the cattle tick rhipicephalus microplus resistant to ivermectin in mexico.three cattle farms with ticks, rhipicephalus microplus, thought to be resistant to ivermectin in yucatan, mexico were studied (sfdo, spn, luady). each field-population was collected and tested twice several months apart. the larval immersion test was used on the progeny of collected adult females to test the susceptibility to ivermectin. dose-mortality regressions, lethal concentrations (lc), their confidence intervals and slope were estimated by probit analysis. resistance ratios (rr) were dete ...201019951828
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