Pakistan, Jan. 18 -- As India launched the world's largest COVID-19 vaccination drive on Saturday (January 16), actress Priyanka Chopra lauded the initiative and expressed gratitude for the frontline heroes.

Priyanka retweeted UNICEF India's tweet which read, "A big moment for India as it starts the #LargestVaccineDrive today! Health workers are the first to receive the #COVID19 vaccine across India. #TogetherAgainstCOVID19."

Responding to UNICEF's tweet, the 'Barfi!' actress wrote, "Bravo India! Congratulations to Indian authorities, medical & health teams for starting off the massive Covid vaccination drive. Forever grateful to our frontline heroes who have been risking their lives this past year to save others."

In the first phase o...