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The amount I dont know about mass vaccination would fill many books, but it does strike me as odd that we've stumbled upon this fact....surely Pfizer can divide required dose volume by volume of vial to calculate the dose per vial.
I'm currently teaching my 8 year old her Maths curriculum, and this question would not be out of place.
Scrabble-
Maybe they put a bit extra "stuff" in the vials to ensure they never have too little?
Regarding getting extra doses, surely a medical-qualitynsyringe is a medical-quality syringe?
I know of at least one practice on the sunny south coast that has been using the extra doses, so I guess they didn't ask
Should have thought it obvious, if you ask Pfizer they're going to say no. Significant loss of income for them if you can vaccinate 20% more people with each batch
Cutthroat_Jake
I doubt it's "watered down" I can only imagine it comes with instructions saying "mix 1 part vaccine with X parts saline" or whatever and they're left with at least another 1 part vaccine per vial.