For the I Love Being Called Gigi Daisy Flower Shirt in other words I will buy this Pfizer-BioNTech and Moderna vaccines, there is no evidence for or against this strategy. The only data is from the clinical trials themselves, which only assessed one schedule (two doses within a month). However, in the UK, studies of the Oxford-AstraZeneca vaccines included a subset that had longer gaps (8-12 weeks), which indicated greater immune response. However, this was a smaller group so it is difficult to tell how robust this result is. It is not clear if the same will be true for the Pfizer-BioNTech or Moderna vaccines.
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There is some evidence that those with prior infection with “natural” immunity have sustained protection for at least 12 weeks or more, so it is reasonable to hypothesize the I Love Being Called Gigi Daisy Flower Shirt in other words I will buy this same might be true for a single vaccine dose. For other infectious diseases, such as with many childhood vaccinations we have seen a little bit of flexibility with “catch up” immunization scheduling, but the CDC discourages excessive delay.