TABLE 3.

Shedding of E. coli O157:H7 (FRIK 1275) in dairy calves following one to four doses in water

Calf no.bResult(s) of sample testing for E. coli O157:H7 on specific dates (mo/day/yr)a
2/15/992/17/992/19/992/22/992/24/992/26/993/1/993/3/993/5/993/8/993/10/993/12/993/15/993/18/993/19/993/22/993/24/993/25/993/26/993/29/993/31/994/2/994/5/994/7/994/9/994/12/99
2980Ic−, I−, I−, IPd
2660I−, I−, I−, IP−
2686I−, Ie−, If−, If+++++++++P+g
2957I−, I++, I+++++++P+h
2979I−, I−, I+++++++++++P−
2961I+++++++++++P+i
2973I−, I++++++++P−
2705I++++++++++P−
2725P−
2702P−
2959P−
  • a Fecal samples collected on 2 February 1999 from all calves tested negative for E. coli O157:H7; +, positive; −, negative.

  • b Inoculated calves were in the same room; control calves were housed in an adjoining but separate room.

  • c I, inoculation with 1 liter of water containing 103 CFU (FRIK 1275)/ml

  • d P, postmortem examination of intestinal tract. Samples were collected from the abomasum, cecum, cranial colon, caudal colon, duodenum, ileum, jejunum, omasum, reticulum, and rumen and tested for the presence of E. coli O157:H7.

  • e Calf no. 2686 consumed only 0.5 liter of inoculum.

  • f Calf no. 2686 would not consume inoculum.

  • g Rumen sample tested positive.

  • h All intestinal samples tested positive. Inflammation, ulceration, and tissue degradation were evident.

  • i Duodenum sample tested positive.