Moderna Inc has said it is boosting manufacturing capacity for its Covid-19 vaccine and expects to make up to three billion doses in 2022, more than twice its previous forecast, Reuters reports.

"As we look forward to next year, we just see so much need for primary vaccine, we are hearing it all over the world, and also boosters," Moderna President Stephen Hoge said in an interview.

"So depending upon [...] how much the ordering that happens is third doses or pediatric doses at 50 micrograms, we could see up to 3bn doses," he added.