Northwestern University

"A total of 32,970 individuals were tested for SARS-CoV-2 antibodies with the blood specimens drawn between May 12-July 12, with a median day of June 28. A total of 5,448 individuals had detectable antibodies. The weighted (for total population of Qatar) antibody prevalence was 24.0%". There were significant differences in antibody prevalence by sex and nationality. After controlling for confounders, odds of antibody positivity in males were 2.9-fold higher than females, and were highest among Bangladeshis and Nepalese, lowest among Qataris. Odds also increased incrementally with age.  Overall, antibody positivity was >88% among those who had their first positive PCR test >15 days before the antibody test." 

Anti-SARS-CoV-2 seropositivity

Raddad L, Chemaitelly H, et al. Characterizing the Qatar Advanced-phase SARS-Sars-CoV-2 Epidemic. 19 July 2020. BioRxiv.  https://doi.org/10.1101/2020.07.16.20155317

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