A Study of Organisms of the Pleuropneumonia Group by Electron Microscopy

摘要

SUMMARY: Electron micrographs of organisms of the pleuropneumonia group are presented, which are consistent with a simple form of development that starts from a small dense body. This grows into a larger particle which may be round, oblong or filamentous in the liquid medium. Later, circumferential concentrations and central thinning occur. Eventually, the concentrations become the dense bodies from which new forms develop. A cell wall was not demonstrable.