CD4 and diabetes mellitus: Key risk factors significantly associated with MRSA colonization (p < 0.05) include hospitalization (RR: 2.2), prior antibiotic use (RR: 1.4), diabetes mellitus (RR: 4.4), HIV with CD4 counts below 200 (RR: 2.8), invasive procedures (RR: 4.8), and being a nurse compared to a physician (RR: 1.8).