Two more fliers who arrived from Dubai between February 23 and March 4 were detected with UK strain of the mutated SARS-CoV-2 virus, that causes Covid-19, on Sunday.
The number of people reaching Calcutta with mutant strains of the coronavirus now stands at six, health department officials said.
Earlier four of them had tested positive for the mutant strains of the coronavirus, including one with the South African-strain, and the rest with the UK-strain.
Among the three fliers tested positive for the UK strain one was admitted to Infectious Diseases (ID) Hospital in Beleghata on Saturday. The state government from Monday will start tracing other passengers and crew members of the flights on which these people had travelled. The family members of those who have tested positive have been asked to undergo RT-PCR test for Covid-19.