The Arizona Department of Health Services has identified another case of E. coli 0157 in Yavapai County, raising the county total to two.

The Health Department previously identified three other cases in Maricopa County and one from Navajo County.

Four out of the six patients ate hamburger prior to the illness, although officials have not confirmed that the hamburger they ate is part of the United Foods recall.  The Arizona Department of Health Services is working closely with the CDC and the USDA to determine the exact source of the hamburger they ate.

Health officials are urging everyone to cook ground beef to 160 degrees F to kill E. coli and most other bacteria.