The certificate confirming I've had two vaccinations for covid is only valid for 3 months. After that time I suppose I'll have to get another one. Why?
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In the NHS App, your COVID-19 status includes a 2D barcode. The expiry date does not apply to your vaccination status. Any expiry date refers only to the barcode and will update automatically each time you go into the NHS App//
Years ago I had certificates confirming I'd been vaccinated against smallpox and yellow fever. They were just bits of paper.
Those were the days. Technology is too complex for me.