But of course - COVID tracking

In your passport no less. From FOX News:

Coronavirus passports with vaccination info in development: report
The future of flying during the coronavirus means carrying a passport to show proof of vaccination against COVID-19.

The International Air Transport Association is in the process of finalizing a digital COVID-19 passport that would include information about a traveler’s COVID-19 testing and vaccinations that would be verified by labs, airlines and government agencies, according to a new report.

What was that about COVID standing for Certificate Of Vaccination ID...