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Originally Posted by 1andrew1

India disproved your theory. The virus mutated into a more contagious variant and people became re-infected.

No it doesn't, the Delta variant could just as easily have mutated into a less contagious variant.

When viruses infect you, they attach to your cells, get inside them, and make copies of their RNA, which helps them spread. If there’s a copying mistake, the RNA gets changed. Scientists call those changes mutations.

These changes happen randomly and by accident. It’s a normal part of what happens to viruses as they multiply and spread.

Because the changes are random, they may make little to no difference in a person’s health. Other times, they may cause disease. For example, one reason you need a flu shot every year is because influenza viruses change from year to year. This year’s flu virus probably isn’t exactly the same one that circulated last year.

If a virus has a random change that makes it easier to infect people and it spreads, that variant will become more common.

The bottom line is that all viruses, including coronaviruses, can change over time.

https://www.webmd.com/lung/coronavirus-strains#1