It did not give a breakdown for the volume of domestic production and imports or say where the vaccine from overseas would come from.

It also said Daiichi Sankyo Co Ltd, Daiichi Sankyo Biotech Co Ltd, Meiji Seika Pharma Co Ltd and KM Biologics Co Ltd will "support supply" in Japan, but gave no other details.

(Reporting by Josephine Mason; editing by Jason Neely)