Those 20+ week numbers for AZ are a bit concerning, and explains why they're doing boosters soon:
Effectiveness against hospitalization after 20 weeks:
16+:
AZ: 77.0%
Pfizer: 92.7%
40-64:
AZ: 64.8%
Pfizer: 95.7%
65+:
AZ: 76.3%
Pfizer: 90.7%
It also makes the statements recently from the Oxford vaccine people saying they didn't believe boosters would be needed for their vaccine baffling.
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