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Quiz - US: COVID Shots for Autumn Must Target Omicron
June 30, 2022
Question 1 / 4
What does the story say “waning immunity” means?
Vaccines are not effective against the virus.
The vaccine’s effectiveness decreases over time.
Immunity immediately decreases after the vaccine.
The vaccine’s effectiveness increases over time.
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Quiz - US: COVID Shots for Autumn Must Target Omicron
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