Additional Risk Factors and Putative Risk Factors for Exposure to MRSA.

*Patients either had an inborn immunodeficiency or were infected with HIV at the time of culture or that they were taking immunosuppressive drugs at the time of culture. Patients with diabetes mellitus, liver disease, cancer, or a rheumatologic disease were not considered to be immunocompromised in the absence of immunosuppressive drug therapy.†Denominators indicated are the number of patients interviewed who answered the relevant questions.‡For MRSA n = 424; for MSSA, n = 79.∫For MRSA n = 277; for MSSA, n = 45.¶For MRSA, n = 276; for MSSA, n = 45.Abbreviations: MRSA, methicillin-resistant Staphylococcus aureus; MSSA, methicillin-susceptible Staphylococcus aureus.