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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

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