Cash,
What people are responding to is you citing natural immunity. Immunity would allow you to be exposed without becoming infected. You should have natural immunity off the charts after multiple infections but if you've really had it 5X you seem to be demonstrating natural susceptibility.
Glad you got over whatever it was quickly. Could have been any number of things so I wouldn’t have jumped to C19, but I’m a data person. I’m skeptical of the testing too but without one you can’t assign cause.
