
FILE - A microbiologist points out an isolated E. coli growth on an agar plate at the Washington State Department of Health, Nov. 3, 2015, in Shoreline, Wash. (AP Photo/Elaine Thompson, File)

FILE - A microbiologist points out an isolated E. coli growth on an agar plate at the Washington State Department of Health, Nov. 3, 2015, in Shoreline, Wash. (AP Photo/Elaine Thompson, File)