Does Exposure to Omicron Help Our Immunity, Even If We Don’t Get Sick? – The Wall Street Journal

Your spouse had Covid-19. The babysitter had it. Or maybe it was your co-worker.

You’ve been exposed to Covid-19 more times than you can count. And yet somehow you’ve never tested positive. Could all these close encounters with Covid-19 be enhancing your immune response to it? The answer isn’t clear-cut, scientists say.