The term "cellular microbiology" was coined by the authors of the book of the same title published in 1996.
[1] Cooperation and mutual dependency between microbiology and cell biology had been increasing in the years before that, and the emergence of a new discipline had been suggested and discussed in several scientific conferences.
Toxins and virulence factors from microbes have been used for decades to influence processes in eukaryotic cells and to study them.
Many microbes modify and influence the synthesis or degradation of the host-cell cytoskeleton, in particular the actin network.
Recently, the field of Cellular Microbiology has been expanded to incorporate investigation of the cell biology of microbes themselves.