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Table 3 SARS-CoV-2-specific antibody titers in relation to detectable SARS-CoV-2 RNA and infectious SARS-CoV-2 in nasopharynx in all COVID-19 patients (n = 36).

From: Shedding of infectious SARS-CoV-2 by hospitalized COVID-19 patients in relation to serum antibody responses

Total SARS- CoV-2 IgG titer Number of patients PCR Positive PCR negative Culture positive Culture negative
no. % no. % no. % no. %
< 20 2 2 100 0 0 2 100 0 0
20 to 40 5 3 60 2 40 2 40 3 60
160 to 320 4 3 75 1 25 0 0 4 100
640 to 2560 25 6 24 19 76 0 0 25 100
Neutralizing antibody titer Number of patients PCR Positive PCR negative Culture positive Culture negative
no. % n % no. % no. %
< 10 3 3 100 0 0 3 100 0 0
10 to 15 5 4 67 2 33 1a 17 5 83
30 to 120 18 7 41 10 59 0 0 17 100
160 to 580 10 0 0 10 100 0 0 10 100
  1. aneutralizing titer 10