Pfizer Inc and its German partner BioNTech said on Thursday that their Omicron-adapted Covid-19 vaccine booster generated a strong immune response against the currently circulating BA.5 and the BA.4 subvariants of Omicron.
The companies said data from a trial in adult patients showed that the booster dose showed a substantial increase in neutralizing antibody levels against the BA.4/BA.5 variants.