This is the WHO " what you need to know about Astrazeneca vaccine". 8 to 12 weeks between the first and second doses is the recommended rate, bearing in mind the vaccine is not totally effective if taken before the recommended rate .[ meaning there is a lower percentage rate of efficiency the earlier the second dose is taken. Some one may know that % rate, I'm not sure.]
The Oxford/AstraZeneca COVID-19 vaccine: what you need to know (who.int)



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