Abstract
Characteristics that promote bacterial colonization of the intestinal mucosal surface were examined in two strains of the common fish pathogen Aeromonas hydrophila, with different pathogenicity. The characteristics examined were chemotactic activity towards mucus, bacterial adherence to mucus and growth in mucus. Intestinal gut mucus of healthy common carp was used. The results indicate that chemotaxis is not necessary for a bacterium to become pathogenic, but it may be a necessary parameter for a bacterium to be an obligate pathogen. Adhesion also seems to be a factor influencing pathogenicity. The results suggest that higher adhesion to mucus and subsequent growth is associated with differences in pathogenicity.
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