Even on general purpose growth media, bacteria can exhibit characteristic patterns of growth. Some examples are shown below. While these growth patterns are an important piece of information when identifying a bacterial species, they are not sufficient for a positive identification. Staining procedures and metabolic tests must be used for a definitive identification.
Growth Characteristics in Broths
Figure 2.6.1: Bacterial growth in broths
Growth Characteristics on Slants
Figure 2.6.2: Bacterial growth on slants
Growth Characteristics on Plates
Figure 2.6.3: Bacterial growth on plates