Pfizer Vaccine Effectiveness: How It Started VS How It’s Going Now

Vaccine effectiveness (VE) is the measure of how well a COVID-19 vaccine protects against either:

Infection
Symptomatic disease
Severe disease
Hospitalization
Or death
That said, Pfizer vaccine effectiveness against symptomatic disease started at nearly 95% back in December of 2020. Now, the story has changed.

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