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1:53
YouTube
Global News
Pfizer COVID-19 vaccine effectiveness drops 6 months after 2nd dose: study
How long does COVID-19 vaccine protection last? It's a question scientists have been asking since the vaccines were first approved for use. Now, a study suggests the protection from the Pfizer vaccine in preventing infection may run out sooner than expected. After six months after a second dose, 46 people tested showed greatly reduced ...
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