Comparative analysis of mRNA and inactivated COVID-19 vaccines: A study from Faisalabad district of Pakistan.

ABSTRACT

BACKGROUND: Pakistan has vaccinated over 122 million people. The two vaccines in widespread use are inactivated (BBIBP-CorV & Sinovac) and mRNA forms (BNT162b2 & mRNA-1273). The primary aim of this study was to compare these two forms of vaccines against unvaccinated individuals collectively and then to see which one is more efficacious. METHODS: Case-control study design was used to compare the efficacy of inactivated and mRNA vaccines against symptomatic infection, hospitalisations and mortality due to Severe Acute Respiratory Syndrome Coronavirus 2 between vaccinated and unvaccinated individuals. We derived recovery time from illness for both vaccines. Furthermore, we also compared the vaccines against similar parameters (symptomatic disease, hospitalisations and mortality). We calculated crude odds ratios for each dependent variable. p value of 0.05 or below was considered significant. RESULTS: Vaccinated individuals were significantly protected from hospitalisations and mortality compared to unvaccinated individuals (p < 0.001). There was no difference in protection from symptomatic disease (p = 0.28), hospitalisations (p = 0.59) and mortality (p = 0.53) between two forms of vaccines. mRNA vaccine had better recovery time than all other vaccines (p < 0.001). DISCUSSION: Our study showed that vaccinated individuals are at low risk of hospitalisations and mortality even without a booster and both vaccine forms are equally effective at preventing hospitalisations and mortality.