That said, there are good reasons to believe a one-dose schedule may not be as efficacious as a two-dose schedule, including against severe disease in high-risk populations, due to magnitude, duration and quality of the immune response. 3/
Of course they considered it. The reason the trials were done like this is very justified.
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Is any vaccine tested specifically with the idea that you might have to ration usage? Dosage and booster requirements based on a lot of considerations, but typically vaccines come at end of outbreak not at height of one.
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