The L-form of Haemophilus pertussis Wittler, Ruth G.,, 5, 1024-1031 (1951), doi = https://doi.org/10.1099/00221287-5-5-1024, publicationName = Microbiology Society, issn = 1350-0872, abstract= 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., language=, type=