Electron Micrographs

6,500x
6,500x
16,000x
20,000x
28,000x
28,000x
70,000x
70,000x
78,000x
96,000x

(28,000X)

Negative staining of group A streptococci viewed by TEM. The "halo" around the chain of cells (approximately equal in thickness to the cell diameter) is the remnants of the capsule that may be found surrounding the exterior of certain strains of group A streptococci. The septa between pairs of dividing cells may also be seen.