I've had it and been directly exposed to it for a prolonged period of time since, haven't caught it again. I'm just one person, but cases of people catching it multiple times seem extremely rare. Rare enough to be chalked up to bad tests.

This is definitely fake. Most posts that make it to the front page are fake. Best way to get karma is to attach a story to an otherwise boring post. "I got the jab" gets nothing. "my dad flagrantly circumvented my mom's wishes to get us the jab" gets all the upvotes.