Filamentation inAeromonas hydrophila

Abstract

Aerobic or 100% CO2cultures of Aeromonas hydrophilagrowing in Tryptone Soya Broth at 5, 10 or 28°C, were examined for filamentation and chain formation. Microscopy indicated that filamentation and chain formation occurred at all temperatures in the presence of 100% CO2. No such filamentation was noted in aerobically grown cells. Cultures exhibiting filamentation were not proteolytically or haemolytically active. Reversion to normal morphology and enzymatic activity occurred within 24 h of subsequent aerobic incubation. The reasons for and adaptive value and pathogenic implications of this response are discussed.