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Table 2 Relationship between ABO/RH blood group 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

Independent variables 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
ABO blood group             
A 61 (17.8) 57 (93.4) 4 (6.6) 0.075 59 (96.7) 2 (3.3) 0.023 59 (96.7) 2 (3.3) 0.174 2.12 (0.60–7.48) 0.245
B 54 (15.7) 51 (94.4) 3 (5.6)   53 (98.1) 1 (1.9)   52 (96.3) 2 (3.7)   1.77 (0.44–7.10) 0.418
AB 10 (2.9) 8 (80.0) 2 (20.0)   8 (80.0) 2 (20.0)   10 (100) 0 (0.0)   7.54 (1.35–42.2) 0.022
O 218 (63.6) 211 (96.8) 7 (3.2)   212 (97.2) 6 (2.8)   217 (99.5) 1 (0.5)   1.00
RH blood group             
RH– 9 (2.6) 8 (88.9) 1 (11.1) 0.353 9 (100) 0 (0.0) 0.580 8 (88.9) 1 (11.1) 0.014 2.66 (0.31–22.7) 0.371
RH +  334 (97.4) 319 (95.5) 15 (4.5)   323 (96.7) 11 (3.3)   330 (98.8) 4 (1.2)   1.00
ABO/RH blood group            
ARh +  58 (16.9) 55 (94.8) 3 (5.2) 0.033 56 (96.6) 2 (3.4) 0.081 57 (98.3) 1 (1.7)  < 0.001 1.00
ARh– 3 (0.9) 2 (66.7) 1 (33.3)   3 (100) 0 (0.0)   2 (66.7) 1 (33.3)   9.17 (0.64–132) 0.103
BRh +  54 (15.7) 51 (94.4) 3 (5.6)   53 (98.1) 1 (1.9)   52 (96.3) 2 (3.7)   1.08 (0.21–5.59) 0.928
BRh– 0 (0.0) 0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)  
ABRh +  10 (2.9) 8 (80.0) 2 (20.0)   8 (80.0) 2 (20.0)   10 (100) 0 (0.0)   4.58 (0.66–31.8) 0.123
ABRh– 0 (0.0) 0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)   0 (0.0) 0 (0.0)  
ORh +  212 (61.8) 205 (96.7) 7 (3.3)   206 (97.2) 6 (2.8)   211 (99.5) 1 (0.5)   0.63 (0.16–2.50) 0.507
ORh– 6 (1.7) 6 (100) 0 (0.0)   6 (100) 0 (0.0)   6 (100) 0 (0.0)   0 (0.0–0.0) 0.999
  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)