@larsmb I answered "No, backed by tests" because both times I've had respiratory symptoms since March 2020, PCR-quality tests said it wasn't COVID; I also take very stringent mitigation measures (e.g. always always always mask indoors around other people, even now). (For the first illness, in about June 2020, I have no idea where I caught it. For the second, I'm pretty sure I caught it outside near a big crowd of runners at a time when flu levels were very high.)

On the other hand, it is *possible* that the cold I had in London in Feb 2020 was COVID-19. It is possible that despite the strict mitigation measures that Spouse and I take, I got an asymptomatic infection. (I do not test if I don't have any symptoms.)