TUCSON, Ariz. (KGUN) — Pima County health officials have confirmed a third measles case involving a Tucson resident and are now classifying the situation as an outbreak. According to the Pima County Health Department, the individual was not fully vaccinated and developed symptoms after direct contact with a previously confirmed measles case. Health officials say measles is considered an outbreak even with a single case due to how easily the virus spreads. MMR vaccines are available at Pima County Health Department clinics regardless of insurance status, as well as at many pharmacies and healthcare providers. For more information about measles, exposure guidance and vaccination locations, residents can visit pima.gov/measles or contact Pima County Health Department Epidemiology.