and because your natural immunity doesn’t work
oh, the science of it all
“because your natural immunity doesn’t work”
You have to develop natural immunity to Covid first.
People can and do die of Covid before natural Covid immunity sets in.
About 600,000 Americans died before natural Covid immunity set in.
If natural immunity was always possible to develop, few people under age 65 would have ever died from infections and getting the kiddies vaccinated would be pointless.
In Israel:
“The Green Pass is an entry permit for those vaccinated or recovered.”
“Who is eligible for a Green Pass, and what limits are there on the Pass?
“Individuals who received two doses of the COVID-19 vaccine and after one full week (2 weeks for the Moderna vaccine) from the second dose – valid through 31.12.2021
“Individuals who recovered from coronavirus – valid through 31.12.2021
“Those who tested negative for COVID-19 (in a PCR swab test) – their Pass is valid for 72 hours from the time of testing and until the end of Pass’s expiration day.”
“Upon entering a place that complies with the Green Pass restrictions, you are required to present your Green Pass, along with identification (identification document, driver’s license, passport). If presenting your Green Pass on the application: You are required to present the screen with the animation.”
“Another option is to print the Green Pass and present it, including the QR code.”
https://corona.health.gov.il/en/directives/green-pass-info/
The EU offers something similar I believe.
“and because your natural immunity doesn’t work”
You may have some level of natural immunity, and if you got Covid, you do have some level of natural immunity, but it may not be enough to get through a new delta infection without vaccination too.