Flu season is starting early, and a changed H1N1 strain may be why
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CDC estimates flu is growing or likely growing in 44 states, and 5.7% of flu tests came back positive in mid-October, compared with under 1% a year ago. Most cases are H1N1 with a new mutation that may dodge some existing immunity. Experts say this year's shot should still protect, though perhaps less. Antivirals work best within 48 hours of symptoms, especially for people 65 and older.
Source: NBC10 Philadelphia
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