Tis the season for last minute doctor’s appointments and long lines at the Duane Reade walk-in pharmacy. Check out WIRED‘s breakdown of what’s actually in your flu shot:
All flu vaccines start with flu viruses: genetic material packaged in an envelope of proteins and fats, studded with yet more proteins—antigens—that push the body’s immune system into action. With thousands of possible flu variants out there, the World Health Organization looks at info from 141 labs around the world to determine which variants are most likely to circulate each year.
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