Rapidly evolving COVID variants complicate vaccine updates – go.nature.com

Vaccines may be more effective if they target new types of SARS-CoV-2, not just the original virus.Credit: Joseph Prezioso/AFP/Getty As countries prepare for another Omicron wave driven by variants BA.4 and BA.5, calls are growing to update COVID-19 vaccines. Current vaccines based on the version of the SARS-CoV-2 virus that emerged in Wuhan, China, in …

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