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How effective are available COVID-19 vaccines? When does protection start?

Here’s a question everybody has now that the COVID-19 vaccines are being distributed across the region, state, and U.S.: How effective are they?

Here’s another: When do they become effective?

Well, it depends on which shot you receive – but it looks something like this. The Pfizer vaccine has a 52% efficacy after 12 days of the first dose. Then, it jumps to 95% after getting the second.

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Meanwhile, the Moderna vaccine was found to be 80% effective a month after the first dose, and 95% effective after the second.

The Johnson & Johnson vaccine only requires one dose, but hasn’t been approved yet. Researchers found that it’s 66% effective against protecting you from getting COVID-19, and 85% effective against the more serious symptoms associated with it. That one takes approximately two weeks to kick in.



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