Kershof, I.M.

patient discharge resistance hospital antibiotic 3 months admission hospitalization study gram-negative bacteria gram-negative colonization population bacteria month oropharyngeal signi frequency sample specimen icu patients infection antibiotic resistance signi ficantly ward population antimicrobial length agents chemother ficant ward patients ampicillin difference resistance frequencies table number colony stool specimens identi fication colonization rates rectal swabs aeruginosa antimicrobial resistance strain change agent fl ora multidrug resistance escherichia coli result oropharyngeal samples coli strains chemother ficantly percentage community antimicrob nosocomial nosocomial infections identi erasmus mc species 0.5 control fication species distribution 2003. resistance dynamics piperacillin care unit rectal klebsiella signi ficant difference vitek 2 system pseudomona multidrug p values klebsiella spp pseudomonas aeruginosa care units value