Fig. 1From: COVID-19 vaccine update: vaccine effectiveness, SARS-CoV-2 variants, boosters, adverse effects, and immune correlates of protectionComponents of Vaccines with WHO EUL. Covid-19 vaccines with WHO EUL are grouped into four main categories based on the component of individual vaccines: RNA, inactivated virus, non-replicating viral vector and protein subunit. (Created with BioRender.com)Back to article page