>>653
ネタじゃね？
混乱してる時期だし情報も色々

https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540747/all/Coronavirus_COVID_19__SARS_CoV_2_#2

One study found the serologic response to a recombinant SARS-CoV-2 nucleocapsid: IgM 85.4%, IgA 92.7% (median 5d after the onset of symptoms), and IgG 77.9% (14d after onset).[8]

Another study from China using IgM and IgG SARS-CoV-2 specific antibodies found < 40% seropositive if illness less than 7d, rising to ~100% 15d or more after onset.