“…As it is presented at table, or in hospital, or in the nursery, our food is regularly contaminated with many different organisms (McKillop, 1959;Riemann, 1969;Anderson and Gatherer, 1970;Ayliffe, Collins and Pettit, 1970;Cooke et al, 1970;Shooter et al, 1970Shooter et al, , 1971 Table 2 summarizes results of studies on carriage rates for so-called typical food-poisoning strains of Cl. welchii.…”