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It’s 70% effective with one shot, 90% with a booster shot a month later.

Not quite.

https://apnews.com/article/astrazeneca-vaccine-third-cheaper...

There were two dosage combinations tested. There was no single-shot testing.

1. Two full dosages (30 days apart?)--62% effectiveness.

2. First shot--50% dosage. Wait 30 days. Second shot--Full dosage. 90% effectiveness.

Combining the results of the two dosages tested yielded a total average 70% effectiveness.
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