Is anyone aware of any studies comparing the second dose timing and delta variant immunity for astrazeneca? I'm seeing a lot of people calling for the second shot to be brought forward to <10 weeks but the original lancet study (admittedly only one study in a limited population with a different variant) showed that efficacy was best when the second shot was over 12 weeks.
Were there any follow-up studies showing the efficacy at different second does timings?