SEATTLE (AP) — The Washington state epidemiologist says more people are being tested for E. coli in Washington state as health officials work to track down the source of an outbreak linked to Chipotle restaurants in the Pacific Northwest.

The official count of people sickened remained at 22 on Monday afternoon, but Dr. Scott Lindquist says about a dozen more people are being tested for the illness in Washington.

Lindquist says he does not expect the number of sick people to increase dramatically, but he said they are not positive yet that the outbreak is limited to people who ate at Chipotle restaurants over the past few weeks. Two people among the 22 cases have told health officials they do not believe they ate at a Chipotle restaurant.

Health officials are aggressively searching for more cases and are trying to find out what the restaurants connected with the outbreak have in common.

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