The effect of culture medium and aeration on growth of Listeria monocytogenes at pH 4.5

This is the authors' abstract. We don't add key points for this paper.

Listeria monocytogenes multiplied at 20°C in medium adjusted to pH 4.5 with HCl, and the lag before growth was eliminated when the inoculum was grown to log phase in the same medium. In a tryptone soya medium with yeast extract and added glucose, growth at pH 4.5 was more rapid than in a tryptose phosphate medium, and this difference was greater in air than under nitrogen. The results show that the bacterium was capable of more rapid growth in air than under nitrogen at this pH and suggest that the tryptose phosphate medium was nutritionally limiting for growth.