The CDC is required by their charter to store the unique vaccine id# ,patient name, date of vaccination and manufacturer of that vaccine. This is all in a database should it be needed that database will be linked to QR coded barcodes just like concert tickets or aircraft boarding passes. It is to be fully expected that for international travel a valid QR code will be required. Remember it is a privilege to enter a foreign country you are their at their pleasure if they require vaccination that’s their right as a sovereign.nation to do that. In the 1980s we had to have all mannor of vaccinations to go to south America the jungle region as well as equatorial Africa with proof before we could even leave the airport customs area. Some nations in Africa still require yellow fever and dengue vaccines before entry even to this day.
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