| Campylobacter geochelonis |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Pseudomonadota (Proteobacteria), Class Epsilonproteobacteria, Order Campylobacterales, Family Campylobacteraceae,
Genus Campylobacter, Campylobacter geochelonis Piccirillo et al. 2016.
Genus Campylobacter, Campylobacter geochelonis Piccirillo et al. 2016.
Gram-negative, straight rods, some are slightly curved, 1-2 µm long. Motile.
After incubation on TSA + 5% sheep blood at 37 ºC for 48 h under microaerobic
conditions, colonies are grey and translucent, tiny (0.1-1 mm in diameter), smooth,
round and not haemolytic. In old cultures, colonies may reach 3 mm in diameter.
Growth is observed on blood agar at 37 ºC under microaerobic and anaerobic
(slightly weaker growth) conditions, but not under aerobic conditions. Does
not require H2 for growth, but able to grow in its presence. Growth is observed at 25 ºC
under microaerobic conditions, not at 18-22 or 42 ºC.
Grows on blood agar with 2% (w/v) NaCl and 1% (w/v) glycine, but no growth in the
presence of 4% (w/v) NaCl. Grows well on CCDA, Karmali and CAT agar, but not on
Muller-Hinton or MacConkey agar. Addition of 0.1% selenite and 0.04 %
2,3,5-triphenyltetrazolium chloride to blood agar inhibit growth. Resistant to nalidixic
acid (30 µg) but susceptible to cephalotin (30 µg).
conditions, colonies are grey and translucent, tiny (0.1-1 mm in diameter), smooth,
round and not haemolytic. In old cultures, colonies may reach 3 mm in diameter.
Growth is observed on blood agar at 37 ºC under microaerobic and anaerobic
(slightly weaker growth) conditions, but not under aerobic conditions. Does
not require H2 for growth, but able to grow in its presence. Growth is observed at 25 ºC
under microaerobic conditions, not at 18-22 or 42 ºC.
Grows on blood agar with 2% (w/v) NaCl and 1% (w/v) glycine, but no growth in the
presence of 4% (w/v) NaCl. Grows well on CCDA, Karmali and CAT agar, but not on
Muller-Hinton or MacConkey agar. Addition of 0.1% selenite and 0.04 %
2,3,5-triphenyltetrazolium chloride to blood agar inhibit growth. Resistant to nalidixic
acid (30 µg) but susceptible to cephalotin (30 µg).
Isolated from the western Hermann’s tortoise (Testudo hermanni hermanni) in northern Italy.
Undetermined.
- Piccirillo A, Niero G, Calleros L, Perez R, Naya H, Iraola G. Campylobacter geochelonis sp. nov. isolated from the western
Hermann's tortoise (Testudo hermanni hermanni). Int J Syst Evol Microbiol 2016; 66:3468-3476.
Positive results for catalase, hippurate hydolysis, nitrate reduction and oxidase.
Negative results for alkaline phosphatase, H2S production on TSI (weak production of H2S on SIM), indoxyl acetate hydrolysis and
urea hydrolysis.
Negative results for alkaline phosphatase, H2S production on TSI (weak production of H2S on SIM), indoxyl acetate hydrolysis and
urea hydrolysis.
(c) Costin Stoica
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