The US regulator has cleared a 30 µg booster dose of a new version of Pfizer’s Comirnaty shot – 15 µg encoding the spike protein of the original wild-type SARS-CoV-2 strain and 15-µg of mRNA coding for Omicron BA.4/BA.5 – for people aged 12 and over.
Moderna’s updated Spikevax shot includes 25 µg of spike protein mRNA from BA.4/BA.5 and 25 µg from the original strain of SARS-CoV-2, and has been authorised for the over-18s. It has also been cleared in the UK.
