title: E. coli O157:H7--a new problem?
mesh_terms: D003428:Cross Infection; D004196:Disease Outbreaks; D004927:Escherichia coli Infections / Q000453:epidemiology* / Q000382:microbiology / Q000635:transmission; D019453:Escherichia coli O157 / Q000302:isolation & purification / Q000821:virology*; D005516:Food Microbiology; D006801:Humans; D009864:Ontario / Q000453:epidemiology; D014871:Water Microbiology