Molecular detection of Rickettsia genus in chigger mites (Trombidiformes: Trombiculidae) collected on small mammals in southeastern brazilian

Chiggers are ectoparasites of vertebrates and may cause trombiculiasis or transmit pathogens to their hosts. Specimens collected from rodents and marsupials were morphologically identified as Herpetacarus hertigi, Eutrombicula tinami, Kymocta sp., Quadraseta brasiliensis, Quadraseta falconensis, Qua...

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Published in:Revista brasileira de parasitologia veterinaria 2019-10, Vol.28 (4), p.563-568
Main Authors: Jacinavicius, Fernando de Castro, Bassini-Silva, Ricardo, Muñoz-Leal, Sebastián, Welbourn, Cal, Ochoa, Ronald, Labruna, Marcelo Bahia, Barros-Battesti, Darci Moraes
Format: Article
Language:English
Subjects:
Animals
Brasil
Candidatus Rickettsia colombianensi
Didelphimorphia
ectoparasitas
Marsupialia - parasitology
Mite Infestations - veterinary
PARASITOLOGY
Polymerase Chain Reaction
Rickettsia - genetics
Rickettsia - isolation & purification
RNA, Bacterial - genetics
RNA, Ribosomal, 18S - genetics
Rodentia
Rodentia - parasitology
Trombiculidae - microbiology
Trombiculídeos
VETERINARY SCIENCES
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Summary:Chiggers are ectoparasites of vertebrates and may cause trombiculiasis or transmit pathogens to their hosts. Specimens collected from rodents and marsupials were morphologically identified as Herpetacarus hertigi, Eutrombicula tinami, Kymocta sp., Quadraseta brasiliensis, Quadraseta falconensis, Quadraseta flochi, Quadraseta mackenziei, Quadraseta pazca, Quadraseta trapezoides, Quadraseta sp., Serratacarus sp., and Trombewingia bakeri. These mites were submitted individually to molecular analyses for the detection of bacteria of the genus Coxiella, Hepatozoon and Rickettsia. Samples were positive to Rickettsia only. Obtained sequences for the gltA (350 pb) and ompA (488 pb) genes were identical to "Candidatus Rickettsia colombianensi", a species previously detected in ticks. In addition, molecular identification of mites based on 18S rDNA sequences are provided for H. hertigi, Kymocta sp., Q. brasiliensis, Q. pazca, Q. trapezoides, Quadraseta sp., and T. bakeri for the first time. This is the first report of the detection of a Rickettsia sp. in chigger mites collected on rodents in Brazil.
ISSN:0103-846X
1984-2961
1984-2961
DOI:10.1590/S1984-29612019069