Since the start of the 2017-18 flu season in October, the Centers for Disease Control and Prevention has reported over 65,735 positive tests for the virus in the U.S., resulting in hundreds of deaths
Seasonal flu vaccines must be updated each year to match the influenza viruses that are predicted to be most common during the upcoming flu season, but protection doesn't always meet expectations
The method is an alternative to needle-and-syringe immunization; with further development, it could eliminate the discomfort of an injection as well as the inconvenience and expense of visiting a flu clinic
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