I'm one of those who tested positive for IgG antibodies in April. Same in June, August. These were Mount Sinai's quantitative research tests, with a high titer.

I'm one of those who tested positive for IgG antibodies in April. Same in June, August. These were Mount Sinai's quantitative research tests, with a high titer. I donated plasma twice. The only symptoms occurred in mid March. Then I got an Abbott qualitative IgG test earlier this month, because I was about to fly to Italy. Still positive. Once there, to end quarantine before the customary two weeks, I got two negative swabs and another Abbott test, but this time they also tested IgM (short term response), which quite surprisingly still came back positive. Since this was the first time it ever got checked, it's not clear if I was IgM positive for the entire six months or I got some exposure in August or early September that didn't result in symptoms or infection. I don't know what this means or if I'm just a rare case, but my inkling is still to explain NYC's current rates with mask wearing and reduced indoor interactions. I guess we'll see in the next four to six weeks.