Nationwide prevalence of multidrug-resistant Pseudomonas aeruginosa was 20.6%.
Of the hospitals, 36% use molecular methods to confirm clonal outbreaks.
Antibiotic resistance was significantly associated with epidemiologic investigations using molecular methods.
Effective identification and isolation of infected patients was associated with decreased resistance.
Level of information and resources dedicated to controlling antimicrobial resistance was associated with multidrug resistance.