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  1. Article: Detection of Babesia venatorum, Anaplasma phagocytophilum and Candidatus Neoehrlichia mikurensis in Ixodes persulcatus ticks from Mongolia

    Karnath, Carolin / Anna Obiegala / Battsetseg Jigjav / Damdindorj Tserennorov / Daniel Kiefer / Henri Derschum / Holger Scholz / Martin Pfeffer / Nyamdorj Tsogbadrakh / Otgonbataar Dashdavaa / Sandra Essbauer / Stephanie Speck

    Ticks and tick-borne diseases. 2016 Mar., v. 7, no. 2

    2016  

    Abstract: Information about the prevalence and geographical distribution of tick-borne pathogens Anaplasma phagocytophilum, Candidatus Neoehrlichia mikurensis, and Babesia spp. is still rare in Mongolia. We tested 275 Ixodes persulcatus ticks for A. ... ...

    Abstract Information about the prevalence and geographical distribution of tick-borne pathogens Anaplasma phagocytophilum, Candidatus Neoehrlichia mikurensis, and Babesia spp. is still rare in Mongolia. We tested 275 Ixodes persulcatus ticks for A. phagocytophilum, Cand. N. mikurensis and Babesia spp. and 125 Dermacentor nuttalli ticks especially for Babesia spp. using different PCR methods. Ticks were collected from three provinces (Selenge, Arkhangai, Khentii) in Mongolia. DNA of A. phagocytophilum, Cand. N. mikurensis and Babesia spp. were found with a prevalence of 6.2%, 1.5% and 3.3% in each case in I. persulcatus ticks. This is the first time Cand. N. mikurensis was found in ticks from Mongolia. Sequence analysis of Babesia spp.-positive amplicons showed exclusively B. venatorum, which had also not been mentioned in Mongolia before. On the contrary, all D. nuttalli ticks tested negatively for Babesia spp. This study demonstrates that all three zoonotic pathogens are present in I. persulcatus ticks in Mongolia, and justify the need for further investigations of a more detailed genetic characterization of these pathogens.
    Keywords Anaplasma phagocytophilum ; Babesia ; Dermacentor ; DNA ; geographical distribution ; Ixodes persulcatus ; pathogens ; polymerase chain reaction ; sequence analysis ; tick-borne diseases ; ticks ; Mongolia
    Language English
    Dates of publication 2016-03
    Size p. 357-360.
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 2541872-5
    ISSN 1877-9603 ; 1877-959X
    ISSN (online) 1877-9603
    ISSN 1877-959X
    DOI 10.1016/j.ttbdis.2015.12.007
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: High detection rate of Rickettsia africae in Amblyomma variegatum but low prevalence of anti-rickettsial antibodies in healthy pregnant women in Madagascar

    Keller, Christian / Alexandra Veit / Andreas Krüger / Benedikt Hogan / Bernhard Fleischer / Cornelia Silaghi / Daniela Pothmann / Henri Derschum / Jean Philibert Rakotondrainiarivelo / Jürgen May / Mirko Girmann / Norbert Georg Schwarz / Raphael Rakotozandrindrainy / Stefanie Kramme / Sven Poppert / Tsiry Razafindrabe

    Ticks and tick-borne diseases. 2016 Feb., v. 7, no. 1

    2016  

    Abstract: Tick-borne spotted fever group (SFG) rickettsioses are emerging infectious diseases in Sub-Saharan Africa. In Madagascar, the endemicity of tick-borne rickettsiae and their vectors has been incompletely studied. The first part of the present study was ... ...

    Abstract Tick-borne spotted fever group (SFG) rickettsioses are emerging infectious diseases in Sub-Saharan Africa. In Madagascar, the endemicity of tick-borne rickettsiae and their vectors has been incompletely studied. The first part of the present study was conducted in 2011 and 2012 to identify potential anthropophilic tick vectors for SFG rickettsiae on cattle from seven Malagasy regions, and to detect and characterize rickettsiae in these ticks. Amblyomma variegatum was the only anthropophilic tick species found on 262 cattle. Using a novel ompB-specific qPCR, screening for rickettsial DNA was performed on 111 A. variegatum ticks. Rickettsial DNA was detected in 96 of 111 ticks studied (86.5%). Rickettsia africae was identified as the only infecting rickettsia using phylogenetic analysis of ompA and ompB gene sequences and three variable intergenic spacers from 11 ticks. The second part of the study was a cross-sectional survey for antibodies against SFG rickettsiae in plasma samples taken from healthy, pregnant women at six locations in Madagascar, two at sea level and four between 450 and 1300m altitude. An indirect fluorescent antibody test with Rickettsia conorii as surrogate SFG rickettsial antigen was used. We found R. conorii-seropositives at all altitudes with prevalences between 0.5% and 3.1%. Our results suggest that A. variegatum ticks highly infected with R. africae are the most prevalent cattle-associated tick vectors for SFG rickettsiosis in Madagascar. Transmission of SFG rickettsiosis to humans occurs at different altitudes in Madagascar and should be considered as a relevant cause of febrile diseases.
    Keywords altitude ; Amblyomma variegatum ; antibodies ; antigens ; cattle ; cross-sectional studies ; disease vectors ; emerging diseases ; fever ; fluorescent antibody technique ; humans ; indigenous species ; intergenic DNA ; nucleotide sequences ; phylogeny ; pregnant women ; quantitative polymerase chain reaction ; Rickettsia africae ; Rickettsia conorii ; rickettsial diseases ; screening ; sea level ; tick-borne diseases ; ticks ; Madagascar ; Sub-Saharan Africa
    Language English
    Dates of publication 2016-02
    Size p. 60-65.
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 2541872-5
    ISSN 1877-9603 ; 1877-959X
    ISSN (online) 1877-9603
    ISSN 1877-959X
    DOI 10.1016/j.ttbdis.2015.08.005
    Database NAL-Catalogue (AGRICOLA)

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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