The US Centers for Disease Control and Prevention (CDC) has recommended the first batch of vaccines go to health care workers and residents of long-term care facilities, with essential workers
Stressing the vaccine had a "strong safety profile", biotech firm CSL said: "The potential for this cross-reaction had been anticipated prior to the commencement of the trial".
With northern hemisphere countries hit by a pandemic winter surge, Britain this week became the first Western country to roll out the Pfizer-BioNTech vaccine.
Past trial results have found that the vaccine induces antibody and T cell immune responses, and is safe in adults aged 18 years and over, including older adults, the study noted.
The Pfizer-BioNTech jab is one of several vaccines bringing hope for an end to the pandemic that has killed more than 1.5 million people worldwide and ravaged economies.
Three leading coronavirus vaccine developers -- Pfizer Inc and AstraZeneca Plc and Bharat Biotech -- have applied for emergency use authorisation in India.
Britain on Wednesday gave emergency approval to the Pfizer-BioNTech coronavirus vaccine, with health officials set to use criteria based on age and vulnerability to decide the order of people to receive it.
Poonawalla joined the Serum Institute of India in 2001 and became the CEO of Serum Institute with complete control of the day-to-day operations of the company in 2011.
As production of the two vaccines expands, 20 million will be reached in December, 30 million in January and 50 million in February, making 100 million total.