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Heptakis(2,6-O-dimethyl)beta-cyclodextrin: a novel growth stimulant for Bordetella pertussis phase I.

ABSTRACT

The effect of cyclodextrins on the growth of Bordetella pertussis Tohama phase I in synthetic medium was evaluated. The addition of cyclodextrins, especially heptakis(2,6-O-dimethyl)beta-cyclodextrin (Me beta CD), to a complete synthetic medium such as Stainer-Scholte medium gave the same number of individual colonies and growth rates as those on Bordet-Gengou medium. Furthermore, with the addition of Me beta CD, growth inhibition by fatty acids such as oleic or palmitic acid was overcome and normal cell growth was observed. This modified Stainer-Scholte medium, designated as cyclodextrin solid medium (CSM), supported excellent growth of 20 lyophilized clinical isolates. Serotypes of the organisms after 10 passages on this CSM plate were not changed. These results suggest that Me beta CD is a significant growth stimulant and CSM is one of the most suitable synthetic media for culture of B. pertussis phase I.

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