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(A) Anti-spike IgG levels developed after each vaccine type by sex ≤ 12 weeks post- 1st vaccination dose. The IgG levels include both reactive (R: ≥10 AU/mL) and non-reactive (NR; <10 AU/mL) values. F denotes female and M denotes male. (B) Anti-spike IgG levels post 2nd vaccination dose. The chart shows similar median IgG titers in both male and females except in the group who received Sinopharm and Sinovac vaccines where females had significantly higher antibody response.
