Members of the Enterobacteriaceae can be distinguished from each other by both motility and the ability to ferment lactose.
There are numerous genera in the Enterobacteriaceae family that are connected to one another both biochemically and genetically. In terms of taxonomy, the Enterobacteriaceae family now consists of around 170 recognized species and 53 named genera, of which 26 genera are known to be connected to infections in humans. This family of bacteria contains a lot of well-known bacteria, including <em>Yersinia</em>, <em>Escherichia coli</em>, etc. They are tiny rods that are gram-negative. They are facultative, non-sporulating anaerobes. MacConkey agar is used to isolate and distinguish organisms of the Enterobacteriaceae family because they have basic nutritional needs.
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