2020: How years of trials, research were compressed into months in developing a Covid-19 vaccine Covid-19 Vaccine: Efforts by the scientific community across the world over the past few months have yielded at least two promising Covid-19 vaccines -- by Pfizer and Moderna Updated: December 23, 2020 7:59:00 pm Prime Minister Scott Morrison, pfizer Australia, BioNTech Australia, COVID-19 cases in Australia, Australia coronavirus cases, Australia latest news, Australia vaccination updates, world news, indian express world news.(Express File) Unprecedented and herculean efforts by the scientific community across the world over the past few months have yielded at least two promising Covid-19 vaccines — by Pfizer and Moderna — that have been developed following all the mandatory clinical trial stages. While the average time to develop and make a vaccine publicly available until now has been 15 years, according to the World Health Organisation, it remains an extraordinary feat to have built a vaccine, and shown it to be safe and effective, for a novel disease that is just one-year old but has upended economies and claimed the lives of 1.65 million people.