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 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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