Cases of the highly contagious norovirus are reported to have doubled in the United States in recent months, according to data shared by the U.S. Centers for Disease Control and Prevention .

Nearly 14% of tests conducted during the most recent week ending November 15 were reported to have yielded positive cases for norovirus, which was twice as much as tests conducted three months prior at 7%. Test positivity measures how many people are confirmed to have norovirus after an illness is suspected, though health experts have acknowledged that it's imperfect, like other forms of measurement, and depends on the number of tests that are ordered, which may vary.

The U.S. had previously seen a record-breaking rate of norovirus cases reported last December at 25%, though cases had been trendi

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