Moderna says COVID-19 boosters effective against variants

Moderna said that a single booster dose of its original COVID-19 vaccine — or a modified version made specifically for the variant first identified in South Africa — offered protection against two SARS-CoV-2 variants of concern.Preliminary phase 2 trial results demonstrated that both vaccines increased neutralizing titers against wild-type SARS-CoV-2 and the two variants —

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