Important negatives.
Dixon
Bernard
B
dixonadams@blueyonder.co.uk
D000818:Animals; D002417:Cattle; D004739:England / Q000453:epidemiology; D004812:Epidemiologic Methods; D004927:Escherichia coli Infections / Q000453:epidemiology*; D019453:Escherichia coli O157 / Q000302:isolation & purification*; D005516:Food Microbiology; D006801:Humans; D008460:Meat / Q000382:microbiology*; D012756:Sheep