Coculture with C. pseudodiphtheriticum is detrimental to S. aureus cell morphology and integrity. S. aureus 2014.N was spread in a lawn on top of agar plates, and C. pseudodiphtheriticum was spotted directly on top. Plates were incubated at 28°C for 24 h, and cells were recovered directly adjacent to C. pseudodiphtheriticum (Inside ZOC) and elsewhere on the plate (Outside ZOC). Changes in S. aureus cell morphology were examined by transmission electron microscopy (TEM) at ×25,000 (a), ×50,000 (b), and ×100,000 (c) magnification.