more infectious Covid-19 variant was first detected, between 25 November and 23 December, has been identified on Tuesday.The infected person has been isolated on arrival and is undergoing treatment. "The National Task Force has also said not to change either existing equipment or existing testing protocol," Tamil Nadu Health Secretary Dr J Radhakrishnan told news agency ANI.Also Read | How Indians lived online during 2020Till date, almost 2,018 passengers had returned from the UK.