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The scientific head of the US operation to develop a vaccine, Moncef Slaoui said Monday that the green light would probably come in December.

Global drugmakers Pfizer and BioNTech said on Wednesday that their COVID-19 vaccine was found 95 per cent effective in the final analysis of the Phase 3 trial.

Pfizer said the vaccine had no serious side effects and that the company will apply for emergency use authorization from US regulators "within days"

Developments on vaccine front offer a tentative timeline on when it could be available on a mass scale

Moderna, whose results stem from a clinical trial of more than 30,000 participants, expects to have approximately 20 million doses ready to ship in the United States by year-end.

Bajaj Finance was the top gainer in the Sensex pack, surging around 9 per cent, followed by IndusInd Bank, L&T, Bajaj Finserv, HDFC, SBI, ICICI Bank, HDFC Bank, ONGC and Axis Bank.

The analysis was conducted on Sunday by an external, independent Data Monitoring Committee (DMC) from the Phase-3 clinical study.