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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.

Quiz - US: COVID Shots for Autumn Must Target Omicron

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