COVID-19 Booster Vaccines Administration in Different Countries

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that resulted in the COVID-19 global pandemic had consequently led to development of different types vaccines, including messenger RNA (mRNA) inactivated virus a protein subunit vaccine, and viral vector recombinant vaccines. Countries worldwide started their national vaccination program as soon vaccines got approved by World Health Organization (WHO) under emergency use listing. This includes Pfizer-BioNTech, Moderna, AstraZeneca, Janssen, Sinovac, Sinopharm. Findings suggested protection against provided these may be waning or reduces variants concern (VOC) even inadequate primary for some risk groups. booster vaccine aims improve prolong COVID-19. review discuss various are being authorized administered, eligibility criteria extent provide United States (US), Israel, Kingdom (UK), Singapore Chile.