I got the Chinese version in China on a 3 day layover in Guangzhou in Feb 2020. Had chest pain for two weeks and fatigue for almost two months. Recovered to 100%. I got the Indian version on a layover in the UK in April 2020. Almost no symptoms but lost my taste and smell for a week. I didn’t even have an antibody response the second time around. My wife had it as well with same symptoms and positive antibody test. I took a tcell test and that was positive. I have not had the vax. I’m currently in Australia and heading to China tonight. I assume I’ll get exposed to the latest variant. I don’t care at all. It’s much less than a cold for me.
Based on the variety of responses it seems that one could have it and not know it. Where do you get these antibody tests to verify?