Pfizer and BioNTech had initially estimated the vaccine was more than 90 per cent effective after 94 infections had been counted in a study that included 44,000 people. READ MORE:* Coronavirus: Second Covid-19 vaccine shows overwhelming success in US tests* Covid-19: Pfizer vaccine could roll out in New Zealand at the start of 2021 if success continues* Coronavirus: Frontrunners in the Covid-19 vaccine raceThe companies have not yet released detailed data on its study, and results have not been analysed by independent experts. Bebeto Matthews/AP Pfizer says its vaccine is highly effective on over 65s. Pfizer and BioNTech said they expect to produce up to 50 million vaccine doses globally in 2020 and up to 1.3 billion doses in 2021. US officials have said they hope to have about 20 million vaccine doses each from Moderna and Pfizer available for distribution in late December.

Source: Stuff November 18, 2020 15:14 UTC