Dynamics of Exposure to Rickettsia parkeri in Cattle in the Paraná River Delta, Argentina

Journal of Medical Entomology
Lucas D MonjePablo M Beldomenico

Abstract

Several cases of human rickettsiosis caused by Rickettsia parkeri were recently documented in the Paraná River delta of Argentina, where the tick vector is Amblyomma triste Koch. As cattle suffer recurrent A. triste infestations, they are at risk of becoming infected with R. parkeri Herein we investigated the dynamics of R. parkeri and its A. triste vector in a herd of beef cattle. Cattle were followed for 18 mo and samples were analyzed for the presence of antibodies against four Rickettsia species (R. parkeri, Rickettsia bellii, Rickettsia amblyommii, and Rickettsia felis) and also for the presence of rickettsial DNA. Additionally, cattle were examined for attached ticks and questing adult ticks were collected. All ticks were analyzed for the presence of rickettsial DNA. No evidence of rickettsemia was found in any cow, but the high R. parkeri infection rate documented in A. triste both questing in the study area (13.9%) and feeding on cattle (19.8%) and the identification of antibodies against R. parkeri antigen in 90% of cattle are evidence that infection is taking place. Altogether, our data suggest that A. triste ticks are capable of naturally exposing cattle to R. parkeri However, the progress of R. parkeri infection and...Continue Reading

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Citations

Dec 8, 2016·Revista brasileira de parasitologia veterinária = Brazilian journal of veterinary parasitology : Órgão Oficial do Colégio Brasileiro de Parasitologia Veterinária·Flávio Haragushiku OtomuraUeslei Teodoro
Jul 20, 2017·The American Journal of Tropical Medicine and Hygiene·Álvaro A Faccini-MartínezMarylin Hidalgo
Apr 21, 2020·Emerging Infectious Diseases·Lucía FargnoliLucas D Monje
Sep 24, 2018·Ticks and Tick-borne Diseases·Lucas D MonjeAlejandro Percara
Sep 28, 2021·Tropical Animal Health and Production·Hend H A M AbdullahSobhy Abdel-Shafy

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