Capnocytophaga
Members
of the genus Capnocytophaga are
filamentous Gram-negative bacilli. They are slow-growing aerobic and anaerobic
bacteria and require presence of CO2 for their growth. The genus is
classified into two groups: (a)
dysgonic fermenter 1 (DF-1) and (b)
dysgonic fermenter 2 (DF-2):
·
DF-1 group consists of three species:Capnocytophaga
ochracea,
Capnocytophaga gingivalis, and
Capnocytophaga sputigena, whichare found as members of the normal flora of
oropharynx in humans. These species have been associated with periodon-titis
and bacteremia. They occasionally cause severe systemic disease, such as
endocarditis in immunocompromised host.
·
DF-2 group bacteria are found only in dogs and not inhumans.
Most Capnocytophaga strains are resistant to
aminoglycosides but are sensitive to broad-spectrum cephalosporins,
fluoroqui-nolones, and penicillins.
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