The Serum Institute of India, which has been working with AstraZeneca to produce the University of Oxford's vaccine candidate which has passed the third phase of clinical trial, has said adequate Covid-19 vaccine is not going to be available for everyone in the world to be immunized until four to five years from now or end of 2024.

The chief executive of one the world's largest manufacturer of vaccines, Adar Poonawalla, has recently dampened the hopes that coronavirus vaccine will be available by the end of this year, in an interview with the Financial Times. He lamented that pharma firms were not ramping up production capacity swiftly to be able to inoculated the world population in a short while.

"It's going to take about four to a maximum of five years until everyone on this planet gets the coronavirus vaccine" , Poonawalla said in a speech. He had earlier predicted that if the covid-19 shot is a two-dose vaccine, as is the case with the previous measles or rota-virus, then the world will be needing 15 billion doses.

The Serum Institute in India has partnered with not less than five international pharmaceutical companies, including AstraZeneca and Novavax, to develop and manufacture a covid-19 vaccine. The firm is also likely to tie-up with Russia's Gamaleya Research Institute to manufacture the Sputnik vaccine already approved by the Russian government to be administered to patients.