Quote:
Originally Posted by Carth
What would a vaccine passport achieve?
I was under the impression that the vaccine neither prevents you from catching Covid or passing it on to others. 
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There is certainly some evidence that both the mRNA (Pfizer/BioNTech and Moderna) and Adenoviral (Oxford/AZ) vaccines reduce viral load either in animal studies, human studies or both. Lower viral load means less virus to spread even if infected.
Of course studies are ongoing here which is why, at this point, you can't say that either types of vaccine prevents infection or infection spread specifically. We can only say it prevent symptomatic infections.
If the human studies confirm what was seen in the animal studies (lower viral load and rapid infection clearance) then that's where a vaccinated but infected person would be a lower risk and that's where passports would be handy