The two children shared a turkey sandwich at a Otis Oergon resaurant over Lab Day weekend.
But Dr. David Long, the Health Officer for Lincoln County says it's a leap to believe that is the definite source.
"We've tested what we feel could be the likely source ,things like food. We went to the restaurant they ate it. We haven't ruled it out, but we haven't ruled it in. It's unfortunate early on the public assumed it was the source and that was unfair."
It will be a couple days before test results will come back.
Because the incubation period for EColi is up to twelve days, the source could be something the two kids were exposed to a week before Labor Day.
The five year old boy in Washignton State is in serious condition at a Tacoma hospital.