India is on track to produce more doses of coronavirus vaccines next year than any other country. The Serum Institute of India, which has contracts for large quantities of the AstraZeneca and Novavax vaccines, has promised the Indian government half of its output.

“India gets priority because it’s my home country,” Adar Poonawalla, the company’s chief executive, said in an interview.

And the billionaire Carlos Slim has helped fund a deal for 150 million doses of the AstraZeneca vaccine in Latin America, drawing on manufacturing capacities in Argentina and his native Mexico.

The AstraZeneca vaccine is well suited to poorer countries because it is inexpensive and easy to store. Far more doses of AstraZeneca’s vaccine have been promised than of any other candidate: 3.21 billion, over half of them committed to poor and middle-income countries. The company has partnered with 10 manufacturers around the world.