Phenotypic Testing Is Often Beneficial in Identifying Infectious Agents from Patient

Phenotypic testing is often beneficial in identifying infectious agents from patient samples; however, some disadvantages include

A) organisms must be grown on the same culture media so it is difficult to distinguish them from each other.
B) lengthy culturing times and the inability to grow some bacteria in vitro.
C) difficulty in identifying motile organisms.
D) non-specificity of some biochemical tests since all pathogens utilize the same substrate as a fuel source.