High magnification of 150,000X, negatively-stained transmission electron micrograph (TEM) revealing some of the ultrastructure morphology exhibited by a number of different microorganisms. Panel 'A' represents a composite micrograph, for comparing the size difference between a poxvirus at the top, a bacillus in the middle and a herpesvirus at the bottom. Panels 'B', 'C' and 'D' are TEMs depicting the sequential degeneration of variola virus patricles.

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Photo credit: © Photo12/Ann Ronan Picture Library / Alamy / Afripics
License: Licensed
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Keywords: 20th, bacillus, century, disease, herpes, medicine, microscopic, pox, research, virus