title: R-plasmids in intestinal Escherichia coli of normal and hospital population.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004926:Escherichia coli / Q000187:drug effects*; D005243:Feces / Q000382:microbiology; D006801:Humans; D007297:Inpatients; D008875:Middle Aged; D010564:Personnel, Hospital; D011815:R Factors