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I had to overcame the initial squick of giving myself a shot first
There are some companies that pasteurise their products and package them in air tight containers so that they will last at least a year or two but then put "short" dates on them to encourage customers to think they are "fresh" and to encourage turnover

PMID: 34798060 | doi:10.1016/S0140-6736(21)01751-7 Frias JP et al
PMID 6129847