Microbiological analyses of canine infected wounds

A total of 57 canine swab samples and wound discharge/aspirates collected during one year from complicated, post operative and infected wounds of traumatic origin have been microbiologically examined. Staphylococcus intermedius isolates were the most prevalent Gram positive bacterium evidenced (28.1%) in infected wounds, followed by Enterobacteria (26.3%) and especially E. coli (21.0%) and Pasteurella multocida (21.0%) among Gram negative bacteria. Obligate anaerobes, only represented by Prevotella melaninogenica were found in 14.0% of isolates. The other minor isolated germs were β-haemolytic Streptococci and actinomycetes among Gram positive ones and Klebsiella pneumoniae, Proteus mirabilis, Citrobacter spp. and Pseudomonas aeruginosa strains. For Staphylococci, the highest resistance percentage (15.0%) was observed against doxicycline and 10% of Streptococci were resistant to amoxicillin. Enterobacteria were frequently resistant to amoxicillin (48.2%) and to doxicycline (34.5%) and more scarcely to chloramphenicol (24.1%), whereas Pasteurella were sensitive to all tested antimicrobial drugs. All anaerobic isolates were sensitive to amoxicillin, tetracycline and metronidazole. These results emphasize the therapeutic interest of antibiotic combinations according to the bacteria variety of the wound infections in dogs.