Abstract
In the assembly of Rickettsia tsutsugamushi progeny in irradiated L cells, nascent forms first appear as undemarcated foci in the host cell granular cytoplasm, in which electron-lucent filamentous (f) and electron-dense granular (g) areas differentiate. Morphological observations indicated that the assembly involves formation of a filamentous network in the f area, manufacture of rickettsial ribosomes in the g area, and formation of mildly electron-dense fuzzy zones, along which a double membrane assembles.
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