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A human case of spotted fever caused by Rickettsia parkeri strain Atlantic rainforest and its association to the tick Amblyomma ovale
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A human case of spotted fever caused by Rickettsia parkeri strain Atlantic rainforest and its association to the tick Amblyomma ovale
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Journal Article
A human case of spotted fever caused by Rickettsia parkeri strain Atlantic rainforest and its association to the tick Amblyomma ovale
2019
Overview
Background
Rickettsia parkeri
strain Atlantic rainforest has emerged in Brazil during the last 10 years, with three laboratory-confirmed human cases. While these cases were epidemiologically associated with the tick
Amblyomma ovale
, in none of them the tick specimens that bit the patients could be identified.
Results
We report a clinical case of spotted fever rickettsiosis that was acquired in an Atlantic forest area in Bahia state, northeast Brazil. The case was determined to be caused by
R. parkeri
strain Atlantic rainforest, based on molecular analysis of the crust removed from the tick bite site (inoculation eschar) of the patients’ skin. DNA extracted from the crust yielded partial sequences of three rickettsial genes (
gltA
,
ompA
and
ompB
), which were 99–100% identical to
R. parkeri
strain Atlantic rainforest. The tick specimen that was attached to patient skin was identified as a female of
A. ovale.
Conclusions
We report the fourth confirmed case of spotted fever rickettsiosis caused by
R. parkeri
strain Atlantic rainforest, providing to our knowledge for the first time, direct evidence of
R. parkeri
strain Atlantic rainforest transmission by
A. ovale
.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
Subject
/ Back
/ Bahia
/ Biomedical and Life Sciences
/ Brazil
/ DNA
/ DNA, Bacterial - isolation & purification
/ Female
/ females
/ Fever
/ Genes
/ Humans
/ patients
/ Rickettsia - isolation & purification
/ Rocky Mountain Spotted Fever - diagnosis
/ Rocky Mountain Spotted Fever - etiology
/ Skin
/ ticks
/ Veterinary Medicine/Veterinary Science
/ Virology
