The fight against the coronavirus continues and, while vaccination advances in the United States and new variants of the virus appear, the question to be analyzed is clear.
How do covid-19 vaccines really work
How effective and how much do vaccines really protect against covid-19? | Video | CNN
2021-04-09T23:19:32.204Z
The fight against the coronavirus continues and, as vaccination advances in the United States and new variants of the virus appear, the question to | Health | CNN
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