Bacteria samples taken from the central zone show a large amount of bacteria with no particular relevance to the cellulitis and resulting from wound colonization. Samples taken from the peripheral zone reveal the presence of non haemolytic oxygen-tolerant anaerobic Streptococci combined with other germs: Staphylococci, Proteus, Enterobacteria, Pseudomonas, etc.

Streptococci seem to play a major role. Isolated in the furthest peripheral zones, they seem to prepare tissues for the infection by other germs. This is the reason why this infection has long been called synergistic42. However it can prove difficult to isolate the Streptococci, which means their role remains invisible and only the other germs are recognised.

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