(Gresham, OR) -- Health officials are warning about a measles exposure at the Legacy Go Health Urgent Care in Gresham. The exposure happened on Thursday between 4 and 8 p.m. Anyone who was at the clinic at that time should monitor themselves for symptoms for 21 days. They are also encouraged to immediately notify their doctor of the potential exposure. Officials urge anyone experiencing Measles symptoms to call ahead to the hospital or clinic so staff can take the necessary precautions before you arrive.