person holding injection

Bivalent COVID-19 booster elicits a stronger response than the original vaccine, Pfizer says

Pfizer and BioNTech said Friday that their bivalent COVID-19 booster, which targets the original strain of SARS-CoV-2 and the omicron BA.4 and BA.5 sublineages, elicits stronger immune responses than their original vaccine.
Adults aged 18 to 55 years experienced a 9.5-fold increase in neutralizing antibody titers against the omicron sublineages compared with pre-booster levels, and people older than 55 years saw a 13.2-fold rise, according to data reported in a press release.
In adults aged older than 55 years, neutralizing antibodies were fourfold higher after receiving the bivalent booster

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