(23.07.2021)

The US government is buying an additional 200m doses of the BioNTech/Pfizer Covid-19 vaccine, expanding its total order to 500m, as officials prepare for the next phase of vaccinations, including children under 12 and potential booster shots.

Doses of the messenger RNA shots — to be delivered between October and April next year — will either be the current formulation or one that has been adapted to coronavirus variants