A new vaccine for cattle slashes the level of E.coli by half. This new vaccine is more potent and needs to be administered only twice instead of three times. While E. coli O157:H7 does not affect cattle it causes food-borne diseases in humans. Vaccines and other products may be given to cattle to help prevent the spread of the bacteria. David Renter associate professor of epidemiology at Kansas State University T.G. Nagaraja an Indian-American professor of microbiology and other Kansas researchers worked on the project to gauge effectiveness of products used to prevent the shedding of E. coli O157:H7 in cattle.