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    1: Ann Agric Environ Med. 2004;11(2):319-22.


    Studies on the occurrence of Gram-negative bacteria in ticks: Ixodes
    ricinus as a potential vector of Pasteurella.


    Stojek NM, Dutkiewicz J.
    Department of Occupational Biohazards, Institute of Agricultural
    Medicine, Jaczewskiego 2, 20-090 Lublin, Poland.
    nina@galen.imw.lublin.pl

    A total of 372 Ixodes ricinus ticks (101 females, 122 males, and 149
    nymphs) collected by flagging in 6 mixed woodlands of eastern Poland
    were examined by culture for the presence of internal Gram-negative
    bacteria other than Borrelia burgdorferi.

    Adult ticks were examined in pools of 2 specimens each and nymphs
    were examined in pools of 3-5 specimens each. Ticks were disinfected
    in 70 % ethanol and homogenized in 0.85% NaCl. The diluted
    homogenate was inoculated onto 3 kinds of agar media: buffered
    charcoal yeast extract (BCYE-alpha) for isolation of fastidious Gram-
    negative bacteria, eosin methylene blue agar (EMB) for isolation of
    enterobacteria, and tryptic soya agar for isolation of all other non-
    fastidious Gram-negative bacteria.

    The Gram-negative isolates were identified with the API Systems 20E
    and NE microtests.

    A total of

    9 species of Gram-negative bacteria were identified, of which the
    commonest were strains determined as Pasteurella pneumotropica/
    haemolytica, which were isolated on BCYE-alpha agar from ticks
    collected in all 6 examined woodlands.

    The total number of these strains (49) exceeded the total number of
    all other strains of Gram-negative bacteria recovered from ticks
    (30).

    Of the total number of examined ticks, the minimum infection rate
    with Pasteurella pneumotropica/haemolytica was highest in females
    (18.8%), and slightly lower in males (12.3%) and nymphs (10%).


    Besides

    Pasteurella pneumotropica/haemolytica,

    the following species of Gram-negative bacteria were isolated from
    examined ticks:

    Pantoea agglomerans,

    Serratia marcescens,

    Serratia plymuthica on EMB agar and

    Aeromonas hydrophila,

    Burkholderia cepacia,

    Chromobacterium violaceum,

    Pseudomonas aeruginosa, and

    Stenotrophomonas maltophilia

    on tryptic soya agar. Minimal infection rates with these bacteria
    were low, ranging from 0.7-5.9%. Of the isolated bacteria,
    Chromobacterium violaceum, Pasteurella pneumotropica/haemolytica,
    Pseudomonas aeruginosa, and Serratia marcescens are potentially
    pathogenic for man and/or animals. In particular, the common
    occurrence of Pasteurella pneumotropica/haemolytica in Ixodes
    ricinus ticks poses a potential risk of pasteurellosis for humans
    and animals exposed to tick bites.

    PMID: 15627343

    --
    wątek informacyjny o chlamydi pn i mykoplsamach

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