The two nurses, who tested positive for Nipah virus, have been admitted to the Beliaghata ID Hospital in Kolkata, a senior state health department official said, while describing their condition as extremely critical on Wednesday.
The 18-year-old recently returned from England where he was pursuing his higher studies.
A passenger called Himadri Barman tested positive on Tuesday, and Nagendra Singh tested positive on Wednesday, said the director of Netaji Subhash Chandra Bose International Airport.
A day after the city saw huge crowds of mid-night revellers thronging the eastern metropolis's busy Park Street to celebrate Christmas, health experts and doctors cautioned the state government against allowing more such gatherings especially during the New Year festivities
Expressing 'pain' at his death and extending condolence to the family of the doctor, Chief Minister Mamata Banerjee said his contribution to fighting the COVID-19 outbreak would encourage others.