Plasma samples
Human convalescent plasma samples were obtained from volunteer donors after 2 months post-vaccination (Table 1) . Plasma samples were heat-inactivated at 56oC for 30 minutes before using for neutralization assays. Sinovac and BioNTech-Pfizer mRNA vaccine BNT162b2 were used for vaccination in Turkey.
Table 1. Vaccination status of human plasma samples used for neutralization assays