India's government has ordered 10 million more doses of the AstraZeneca COVID-19 vaccine from the Serum Institute of India, a company spokesman told Reuters on Tuesday.

The world's biggest vaccine-making company had earlier supplied 11 million doses to the government's inoculation campaign that began on Jan. 16. 

Covishield Vaccine

The second order is already in place, it's for 10 million doses

"The second order is already in place, it's for 10 million doses," an SII spokesman said, adding that the figure was part of the 100 million doses the company has agreed to sell to the government for 200 rupees ($2.74) each.

Bharat Biotech, which developed its vaccine with the state-run Indian Council of Medical Research, has supplied 5.5 million doses. A Bharat Biotech spokeswoman said it was selling 4.5 million more. India's drug regulator says SII's COVISHIELD vaccine is about 72% effective, while Bharat Biotech says COVAXIN's last-stage trial results are expected by March.

The regulator is expected to approve Russia's Sputnik V and Cadila Healthcare's ZyCov-D vaccines in the next few months. India's infections rose 9,110 in the last 24 hours to stand at 10.85 million, the world's highest tally after the United States, though they have fallen sharply from a mid-September peak of nearly 100,000.

The health ministry said a daily toll of less than 100 deaths over the last four days took the total to more than 155,000.