Existence of immunological memory response in true sero-negative individuals post COVID-19 molecular diagnosis.

Lustig, Yaniv; Mendelson, Ella; Mandelboim, Michal; Biber, Asaf; Levin, Einav G; Cohen, Carmit; Regev-Yochay, Gili; Schwartz, Eli · Clin Infect Dis · 2022

case_series · Level IV

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Abstract

Approximately 1-8% of individuals do not develop antibodies following SARS-CoV-2 infection (sero-negatives). One BNT162b2 dose resulted in potent humoral response in 14 sero-negatives and 15 sero-positives, significantly higher than the response of 15 naïve-individuals, to two doses suggesting that COVID-19 provoked a memory response in individuals without detectable antibodies.