AstraZeneca joins Serum Institute to supply 2 billion doses of coronavirus vaccine br br AstraZeneca has agreed terms with Serum Institute of India to supply one billion doses for low and middle-income countries br br Britain's AstraZeneca has tied up with Serum Institute of India and two Bill Gates-backed global health organisations as it looks to deliver two billion doses of its potential coronavirus vaccine this year and next, double the previous numbers, br br The company, which has already agreed to supply 400 million doses to the United States and British governments, said on June 4 it had agreed terms with Serum Institute of India, the world's largest manufacturer of vaccines by volume, to supply one billion doses for low and middle-income countries.