Infection often involves several bacterial species. Anaerobes and facultative anaerobes most frequently isolated include:

Pasteurella multocida Nocardia asteroides
Bacteroides spp Rhodococcus equi
Streptococcus spp Dermatophilus congolensis
Fusobacterium spp Mycoplasma spp
Actinomyces spp Mycobacterium spp
E. coli  

Fungi are sometimes found, mainly as secondary invaders in chronic abscesses, for example:

Candida spp Trichosporon spp
Microsporum spp Hyphomycetes
Trichophyton spp Sporothrix schenki

Occasionally viruses may also be isolated from abscesses, for example:

cowpox virus

herpesvirus-1 (FHV-1)

calicivirus (FCV)

Cowpox virus may be part of the cause of cellulitis or a persistent abscess. FHV and FCV can cause skin ulceration, but they are usually regarded as contaminants if isolated from an abscess rather than the cause of the lesion. They are probably transmitted in saliva from the oropharynx by the cat licking at its wound.

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