In NHs in Shanghai, 22.3% and 10.2% residents were colonized by S. aureus and MRSA.
Previous hospitalization was independent risk factor for MRSA colonization.
Invasive device was independent risk factor for MRSA colonization.
Chloramphenicol therapy was independent risk factor for MRSA colonization.
Macrolides therapy was independent risk factor for MRSA colonization.