Final answer:
Inclusion bodies are the bacterial structures least likely to directly assist a bacterium in causing an infection. They act as storage sites within bacterial cells, while the other listed structures play more active roles in infection processes.
Step-by-step explanation:
In the context of bacterial structures, Inclusion bodies would be least likely to directly assist a bacterium in causing an infection. The roles of the other listed structures are relatively direct: Flagella are tail-like structures that help bacteria move towards or away from stimuli (process known as chemotaxis), assisting in the infection process; Capsule helps the bacterium to evade an immune response, thus promoting infection; and Pili (or fimbriae) assist in attachment to host tissues, also an important step in infection. Inclusion bodies, on the other hand, are primarily storage sites or repositories for nutrients or metabolic products within the bacterial cell, not generally associated with causing disease directly.
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