FILAMENTATION IN AEROMONAS-HYDROPHILA

Aerobic or 100% CO2 cultures of Aeromonas hydrophila growing in Trypto ne Soya Broth at 5, 10 or 28 degrees C, were examined for filamentatio n and chain formation. Microscopy indicated that filamentation and cha in formation occurred at ail temperatures in the presence of 100% CO2. No such filamentation was noted in aerobically grown cells. Cultures exhibiting filamentation were not proteolytically or haemolytically ac tive. Reversion to normal morphology and enzymatic activity occurred w ithin 24 h of subsequent aerobic incubation. The reasons for and adapt ive value and pathogenic implications of this response are discussed. (C) 1998 Academic Press.