RT Journal Article SR Electronic T1 Cattle, Hay, and E. coli JF Science JO Science FD American Association for the Advancement of Science SP 49 OP 49 DO 10.1126/science.284.5411.49g VO 284 IS 5411 A1 Hancock, Dale D. A1 Besser, Thomas E. A1 Gill, Colin A1 Bohach, Carolyn Hovde YR 1999 UL http://science.sciencemag.org/content/284/5411/49.7.abstract