Flu activity increased over the past week, squelching hopes of an early peak and leading at least 12 states to shut down some schools.
Flu activity is expected to remain elevated for weeks, with 18 states and New York City experiencing high activity last week, an increase over the previous week when only nine states reported the same.
States reporting widespread activity rose from 30 to 36 during the same week over the previous one, with an additional 11 states and Puerto Rico reporting regional activity.
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