When performing phage typing to identify an unknown bacterium, we must have into account the viruses that will specifically infect the bacterium we're trying to identify.
A bacteriophage is a specific virus that is able to infect a given bacterium or a group of bacteria species. The expression phage typing involves the identification of these bacteriophages in a given sample, which may depend on our ability to biochemically identify these entities (ie., these viruses).
Therefore, we can conclude that bacteriophages are viruses that infect bacteria and they can be identified by phage typing.
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