Zusammenfassung
Background: Coronavirus disease 2019 (COVID-19) caused by SARS-CoV-2 is an contagious illness that emerged in December 2019, remains a serious threat it has caused millions of deaths around the world, resulting in a global pandemic. COVID-19 vaccines protect against this severe illness through different approaches. Sinopharm and Pfizer-BioNTech COVID-19 vaccines were the greatest used vaccines in Iraq. Both vaccines have a specific mechanism to activate the immune system in human body.
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