FIG. 2.

Fecal shedding (day 14 to day 21 p.i.) of E. coli O157:H7 and total coliforms by calves maintained on a dietary stress regimen and calves that were well fed. Calves were inoculated with 10¹⁰ CFU of E. coli O157:H7 on day 0. Calves that were well fed on day 1 to day 14 p.i. were subjected to dietary stress by having food withheld for 48 h beginning on day 15; they were fed a one-half ration on day 17 and then were fasted for 48 h until day 19, when the normal diet was resumed. Calves that had been subjected to dietary stress on day 1 to day 5 p.i. were well fed from day 14 to day 21 p.i. The asterisk indicates calf 1, which is described in the text. The sensitivity of the enrichment culture is <50 CFU/g. (A) E. coli O157:H7 recovered from well-fed calves. (B) E. coli O157:H7 recovered from diet-stressed calves. (C) Total coliforms recovered from well-fed calves. (D) Total coliforms recovered from diet-stressed calves.