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In page Monoclonal B-cell lymphocytosis:

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Studies have identified MBL in ~30% of patients infected with the hepatitis C virus, found increased risks of CLL/SLL-MLB in patients with pneumonia, and decreased risk of CLL/CSS MBL in patients who have been vaccinated for influenza or pneumonia. Herpes Zoster and various upper respiratory tract infections are also considered to be risk factors for developing CLL/SLL MBL. It seems possible that the pathogens involved in these diseases provide antigens that stimulate the development of MBL although further studies are required to explore this hypothesis further.[1]