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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
It typically takes about two weeks for the flu shot to fully kick in, Swartzberg said.
Source: https://www.huffpost.com/entry/flu-shot-vaccine-season_l_63cfe5d0e4b0c8e3fc79deb6
Patients in nursing homes, Swartzberg said, are among the most vulnerable people in our society.