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Is it cheaper, easier and more within our control to bet on the appearance of more vaccine in a timely fashion or controlling the virus? I reckon I'd back Tony's plan before Hancock's
deleted-
The study was not designed to assess the efficacy of a single-dose regimen. Nevertheless, in the interval between the first and second doses, the observed vaccine efficacy against Covid-19 was 52%, and in the first 7 days after dose 2, it was 91%, reaching full efficacy against disease with onset at least 7 days after dose 2.
https://www.nejm.org/doi/full/10.1056/NEJMoa2034577I've only skimmed it, because it's present wrapping time, but that to me says one dose is effective half the time. A second dose takes it up to 91%.
Chalfie
You need to be able to have the second dose available for those who've had the first dose. Otherwise the effectiveness is diminished.
More simply: do you trust this shower of shit to actually remember who's needs one and who needs two.