I think everyone in this thread is applying a binary model of immunity - either you are immune or you aren't, either a variant escapes or it doesn't. But immun

I think everyone in this thread is applying a binary model of immunity - either you are immune or you aren't, either a variant escapes or it doesn't. But immunity is analogue. A strong, specific, antibody response can prevent infection. A T-cell response can stop infection turning into severe illness and death. Variants can evade antibodies somewhat easily, but find it much harder to evade T-cells. Antibody levels wane in weeks or months (although memory B-cells remain), T-cells remain active for years or decades. If you had COVID last winter, then there would be a good chance of you getting it again this winter, even if it was the exact same strain. But you'd be much less likely to die of it. So when does the pandemic "end"? What is a "pandemic"? If tens of percent of the population are catching every winter, but few are dying, is that still a pandemic?