... the EU drug regulator said the two messenger RNA boosters offered protection both against the original version of COVID-19 and the omicron subvariant BA.1, which has since been overtaken globally by later omicron subvariants BA.4 and BA.5. Nearly 80% of coronavirus cases worldwide are now being caused by omicron BA.5, according to the World Health Organization.
The study findings indicated that variant-modified booster vaccines could result in significantly higher neutralization titers against prevalent and ancestral SARS-CoV-2 variants compared to ancestral-based boosters.