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The distribution of  Rickettsia parkeri  in South America has been associated with  Amblyomma triste  ticks. The present study evaluated under laboratory conditions two colonies of  A. triste : one started from engorged females that were naturally infected by  R. parkeri  (designated as infected group); the other started from noninfected females (designated as control group). Both colonies were reared in parallel for five consecutive generations. Tick-naïve domestic rabbits were used for feeding of each tick stage and generation.  R. parkeri  was preserved by transstadial maintenance and transovarial transmission in  A. triste  ticks for five consecutive generations, because all tested larvae, nymphs, and adults from the infected group were shown by PCR to contain rickettsial DNA. All rabbits infested by larvae, nymphs, and adults from the infected group seroconverted, indicating that these tick stages were all vector competent for  R. parkeri . Expressive differences in mortality rates were observed between engorged nymphs from the infected and control groups, as indicated by 65.9% and 92.4% molting success, respectively. Our results indicate that  A. triste  can act as a natural reservoir for  R. parkeri . However, due to deleterious effect caused by  R. parkeri  on engorged nymphs, amplifier vertebrate hosts might be necessary for natural long-term maintenance of  R. parkeri  in  A. triste .

biomed research international

Comparative Evaluation of Infected and Noninfected<i>Amblyomma triste</i>Ticks with<i>Rickettsia parkeri</i>, the Agent of an Emerging Rickettsiosis in the New World

Comparative Evaluation of Infected and NoninfectedAmblyomma tristeTicks withRickettsia parkeri, the Agent of an Emerging Rickettsiosis in the New World