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- 저자 : Hizo-Teufel, Cecilia (검색결과 1 건)
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Hagen, Ralf Matthias,Frickmann, Hagen,Ehlers, Julian,Krü,ger, Andreas,Margos, Gabriele,Hizo-Teufel, Cecilia,Fingerle, Volker,Rakotozandrindrainy, Raphael,Kalckreuth, Vera von,Im, Justin,Pak, Gi De Elsevier 2018 Acta tropica Vol.177 No.-
<P><B>Abstract</B></P> <P>The occurrence of tick-borne relapsing fever and leptospirosis in humans in Madagascar remains unclear despite the presence of their potential vectors and reservoir hosts.</P> <P>We screened 255 <I>Amblyomma variegatum</I> ticks and 148 <I>Rhipicephalus microplus</I> ticks from Zebu cattle in Madagascar for <I>Borrelia</I>-specific DNA. <I>Borrelia</I> spp. DNA was detected in 21 <I>Amblyomma variegatum</I> ticks and 2 <I>Rhipicephalus microplus</I> ticks. One <I>Borrelia</I> found in one <I>Rhipicephalus microplus</I> showed close relationship to <I>Borrelia theileri</I> based on genetic distance and phylogenetic analyses on 16S rRNA and <I>flaB</I> sequences. The borreliae from <I>Amblyomma variegatum</I> could not be identified due to very low quantities of present DNA reflected by high cycle threshold values in real-time-PCR. It is uncertain whether these low numbers of <I>Borrelia</I> spp. are sufficient for transmission of infection from ticks to humans.</P> <P>In order to determine whether spirochaete infections are relevant in humans, blood samples of 1009 patients from the highlands of Madagascar with fever of unknown origin were screened for <I>Borrelia</I> spp. − and in addition for <I>Leptospira</I> spp. − by real-time PCR. No target DNA was detected, indicating a limited relevance of these pathogens for humans in the highlands of Madagascar.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>Borrelia</I> spp. DNA was detected in <I>Amblyomma (A.) variegatum</I> ticks and <I>Rhipicephalus (R.) microplus</I> ticks in Madagascar. </LI> <LI> DNA of a <I>Borrelia (B.) theileri</I>-related borreliae was detected in <I>R. microplus</I> for the first time in Madagascar. </LI> <LI> Only low amounts of <I>Borrelia</I> spp. DNA were detected in the assessed ticks, indicating low numbers of organisms and indicating an at the most limited risk of transmission to humans. </LI> <LI> <I>Borrelia</I> spp. DNA was absent in the blood of fever patients from the highlands in Madagascar. </LI> <LI> <I>Leptospira</I> (<I>L.</I>) spp. DNA was absent in the blood of fever patients from the highlands in Madagascar. </LI> </UL> </P>
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