Study results on the preventive effect of the AstraZeneca, Pfizer, and Moderna vaccine against variants showed that the vaccines had a preventive effect of over 80% after completing the two-dose regimen.

The prevention effect was greater against the Alpha variant than the Delta. In preventing symptomatic infections, the vaccines had a similar prevention effect against variants and the original virus.

Mixed vaccination using the AstraZeneca and Pfizer vaccine showed a neutralizing antibody response that was similar or higher than that of those using two shots of the same vaccine and the systemic reaction was at an acceptable level.

The National Evidence-based Healthcare Co