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He tested positive for COVID-19 in a test conducted at the airport on November 9, after which his samples were sent for genome sequencing.
Earlier this month, Pfizer said its pill cut the risk of hospitalisation and death by nearly 90% in people with mild to moderate coronavirus infections.
The combination treatment, which will have the brand name Paxlovid, consists of three pills given twice daily.
The data suggests that the drop is due to waning efficacy, rather than more contagious variants, researchers said.
The United States, Israel and some European countries have rolled out vaccinations to children more broadly, putting pressure on the British government to follow suit.
India rolled out one of the world's largest vaccination drives earlier this year and has been relying heavily on the AstraZeneca vaccine produced by the Serum Institute of India and a home-grown shot produced by Bharat Biotech.
Pfizer, which is ready to offer 5 crore doses to India between July and October this year has sought certain relaxations including indemnification.
Whether COVID-19 vaccines work and are safe to use on children is one of the big questions drugmakers are trying to answer.
Pfizer and BioNTech plan to initially test the safety of their two-shot vaccine at three different dosages - 10, 20 and 30 micrograms - in a 144-participant Phase I/II trial.
The encouraging developments come as the coronavirus continues surging across much of the world.