In the past several weeks, manufacturers have started shipping flu vaccines and expect to supply a record 143 million doses to the U.S.
Flu shots are being shipped earlier than usual this year to ensure that an adequate supply is in the hands of doctors, clinics and other providers by the end of October.
Figures from the Centers for Disease Control and Prevention showed that last year's vaccine turned out to be a good match for only about 40 percent of the flu making the rounds.
This year, every strain included in the shot is new, including a new Australian variety known as Brisbane/10 that made many people sick last winter.
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