Side effects – n (%) Astra Zeneca Astra Zeneca Pfizer-BioNTech Pfizer-BioNTech P1 P2
First dose
(N=441)
Second dose
(N=265)
First dose
(N=513)
Second dose
(N=414)
Pain and swelling at injection site 354 (80.3) 38 (14.3) 418 (81.5)
169 (40.8)
0.696
<0.001
Redness at injection site 11 (2.5) 1 (0.4) 8 (1.6) 11 (2.7) 0.425 0.034
Itching at injection site 70 (15.9) 5 (1.9) 64 (12.5) 9 (2.2) 0.158 1
Self-reported fatigue 261 (59.2) 15 (5.7) 60 (11.7) 64 (15.5) <0.001 <0.001
Sore throat / Running nose 14 (3.2) 0 (0.0) 3 (0.6) 0 (0.0) 0.006 .
Coughing 6 (1.4) 0 (0.0) 0 (0.0) 2 (0.5) . .
Headache 183 (41.5) 7 (2.6) 43 (8.4) 37 (9.0) <0.001 0.002
Muscle pain 187 (42.4) 10 (3.8) 49 (9.6) 38 (9.2) <0.001 0.011
Chilling 159 (36.1) 5 (1.9) 14 (2.7) 16 (3.9) <0.001 0.219
Over 38oC fever 113 (25.6) 13 (4.9) 1 (0.2) 49 (11.9) <0.001 0.003
Nausea 34 (7.7) 0 (0.0) 5 (1.0) 5 (1.2) <0.001 .
Joint pain 78 (17.7) 19 (7.2) 8 (1.6) 14 (3.4) <0.001 0.04
Stomachache 7 (1.6) 2 (0.8) 1 (0.2) 0 (0.0) 0.028 .
Diarrhea 16 (3.6) 0 (0.0) 2 (0.4) 2 (0.5) 0.001 .
Rash skin 4 (0.9) 1 (0.4) 1 (0.2) 0 (0.0) 0.188 .
Vaginal hemorrhage 4 (0.9) 0 (0.0) 1 (0.2) 0 (0.0) 0.188 .
Thrombocytopenia 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) . .
Myocarditis 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) . .
Anaphylactic shock 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) . .