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The hospital says a former surgical technologist is being investigated in Colorado for diverting and tampering with medications in a way that could have exposed patients to the various diseases

It's unclear whether that person did the same thing in Seattle.

The hospital says the exposure risk is low, but they're testing affected patients just to be safe.

Anyone who had surgery during the time period at the hospital is encouraged to call the Northwest Hospital hotline at 206-368-1002 or toll free at 1-800-695-0654 to receive more information about how to access free testing.

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