Isn't the figure for the second dose based on the studies of 21 days, that % immunity could drop due to the delay, plus did the studies have enough testing to prove that a single dose would be effective over 12 weeks.
@kidboy started
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Isn't the figure for the second dose based on the studies of 21 days, that % immunity could drop due to the delay, plus did the studies have enough testing to prove that a single dose would be effective over 12 weeks.