WILLSHANG A, CHEASTY T, SMITHH R, O'BRIENS JandADAKG K(2001),Verocytotoxin- producingEscherichiacoli(VTEC)O157and otherVTECfromhumaninfections in Englandand Wales:1995±1998',J MedMicrobiol, 50 , 135±142. WOODSR I, WOODWARDJandWATTERSON P(1988),Thecauseof rapidinfantmortality
declinein Englandand Wales,1861±1921,part 1',PopulationStudies, 42 , 343±366.
28 Handbookof hygiene controlin the foodindustry