A virulent strain of motile aeromonad (77-18) and an avirulent strain (78-16) differed in the contents of lipids and phospholipids, odd fatty acids, activity of hydrolytic enzymes, and amount of proteins with molecular weights of 47-56 kDa. It is assumed that proteins with molecular weights of 47-56 kDa, proteolytic enzymes active within a wide pH range, and odd fatty acids may act as pathogenicity factors. Each of these compounds or their combination determines certain stage of infection.
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