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SUMMARY:The microcyst stage of Salmonella typhi, Proteus vulgaris, Bacterium coli and Pseudomonas fluorescens is non-motile and devoid of flagella. Observations by electron- and photomicroscopy indicate that the flagella grow outwards through the cell wall of the germinating microcyst. They commence to develop after about 2 hr. incubation. Alike in bacteria with peritrichous and polar flagelia a single, polar or sub-polar flagellum develops first. In the process of maturation the flagella are shed and the non-motile microeysts produced. Basal granules may occasionally be observed.
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