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Table 3 Relationship between the period of time and SARS-CoV-2 infection among 343 blood donors from Luanda, Angola

From: Seroprevalence of anti-SARS-CoV-2 antibodies and risk factors among healthy blood donors in Luanda, Angola

Months
2019–2020
N (%) Anti-SARS-CoV-2 positivity Past infection Recent infection Univariate analysis
   No (%) Yes (%) p-value* No (%) Yes (%) p-value* No (%) Yes (%) p-value* OR (95% CI) p-value
December/2019 25 (7.3) 25 (100) 0 (0.0)  < 0.001 25 (100) 0 (0.0)  < 0.001 25 (100) 0 (0.0) 0.452 0 (0.0–0.0) 0.998
January/2020 145 (42.3) 144 (99.3) 1 (0.7)   145 (100) 0 (0.0)   144 (99.3) 1 (0.7)   0.03 (0.0–0.22) 0.001
February/2020 42 (12.2) 42 (100) 0 (0.0)   42 (100) 0 (0.0)   42 (100) 0 (0.0)   0 (0.0–0.0) 0.997
July/2020 52 (15.2) 51 (98.1) 1 (1.9)   52 (100) 0 (0.0)   51 (98.1) 1 (1.9)   0.08 (0.01–0.63) 0.017
August/2020 24 (7.0) 21 (87.5) 3 (12.5)   22 (91.7) 2 (8.3)   23 (95.8) 1 (4.2)   0.57 (0.14–2.27) 0.426
September/2020 55 (16.0) 44 (80.0) 11 (20.0)   46 (83.6) 9 (16.4)   53 (96.4) 2 (3.6)   1.00
  1. Past infection (IgG+/IgM−) and Recent infection (IgG−/IgM+ or IgG+/IgM+)
  2. The bold numbers were statistically significant (p < 0.05)
  3. *Chi-square test (X2)