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SUMMARY: Ageing, chilling, and media containing suitable concentrations of glycine were found to stimulate the production of L-forms in cultures of Haemophilus pertussis. Stained with Giemsa these L-forms are morphologically similar to the L-forms of many other bacilli produced by similar stimuli. Serologically the L-and bacillary forms appearto be related. The suggestion is put forward that the small round red form is a ‘resistant’ form of H. pertussis and reverts to the rod by passing through the stages characteristic of the L-cycle.
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