Side Effects Associated With Homologous and Heterologous COVID-19 Vaccines: A Cross-Sectional Study in Saudi Arabia.

Background: Numerous studies on coronavirus disease 2019 (COVID-19) vaccination safety have been conducted in Saudi Arabia. Even though there is less evidence comparing the side effects of different vaccines and a few of them studied the side effects of mixing different platforms of vaccines.

Objectives: This study aimed to evaluate the type and severity of adverse effects following COVID-19 vaccination based on the type and platform of received vaccine and to determine factors that contribute to the occurrence of these side effects.