The situation has worsened significantly since measles reached its highest level in 33 years last summer, when cases were still climbing across fewer states. Virginia’s statewide rate was 95.6%, but the measles outbreak was in two rural counties west of Richmond where measles vaccination rates are less than 75%. Colorado has reported measles cases this year, prompting local health officials to urge parents to check their children's vaccination records. Oklahoma has a low childhood vaccination rate of 88.7% and saw 20 cases last year, but only one so far this year. The state’s first measles cases in a decade climbed to five cases in a few days.