TABLE 2.

Numbers of animals shedding high levels of E. coli O157:H7

DateNo. of animals shedding ≥200 CFU of E. coli O157:H7/g of feces in pena:
1 (n = 35)b2 (n = 36)3 (n = 30)4 (n = 32)5 (n = 30)6 (n = 31)7 (n = 29)8 (n = 32)9 (n = 32)10 (n = 32)Total (n = 319)
Sept. 14112
Oct. 1818 (4)8 (4)9 (2)14 (1)1 (1)32 (12)
Nov. 153 (1)7 (2)63 (1)6 (2)8 (2)235 (8)
Dec. 13126 (1)221 (1)3 (1)118 (3)
Jan. 1011 (1)2 (1)4 (2)
Feb. 7112
Mar. 72 (1)13 (1)
Apr. 41 (1)1 (1)
Apr. 18115 (6)16 (6)
May 218 (2)9 (2)
  • a The numbers in parentheses are the numbers of animals shedding >104 CFU of E. coli O157:H7/g of feces (i.e., supershedders). No data indicates that no animals were determined to be shedding E. coli O157:H7 at levels of ≥200 CFU/g of feces.

  • b n is the number of animals per pen.