BISMARCK — After six new measles cases were reported in North Dakota over the weekend, three in Williams County in the state's northwest corner and three in Grand Forks County, the state's rate of confirmed cases now leads the nation.

While national measles case data has been changing rapidly on a weekly and even daily basis since an outbreak began in Texas in late January, the rising outbreak in North Dakota has steadily caught up with that of New Mexico, the state which previously had the highest rate in the U.S. New Mexico and North Dakota were tied for the country's highest rate of about 3.7 cases per 100,000 residents at the end of May.

According to data from the North Dakota Public Health Association, on June 3, North Dakota's rate stood alone at the top with 4.3 cases per 100,000

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