You should test for capsule formation primarily in the genera Bacillus, Mycobacterium, and Staphylococcus. Bacillus species often produce capsules that can aid in virulence, while some Mycobacterium species, such as Mycobacterium tuberculosis, have a complex cell wall that can resemble a capsule. Staphylococcus aureus is known for its polysaccharide capsule, which contributes to its pathogenicity. The other genera listed generally do not have notable capsule characteristics.
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