surge in coronavirus cases in Tamil Nadu and were mostly from apartment complexes, state health secretary J Radhakrishnan has said.The government was focussing on the 'test, track and treat' plan and increased testing of samples to curtail the spread, Radhakrishnan said while speaking to reporters after inspecting additional Covid-19 beds at the Rajiv Gandhi Government General Hospital.J Radhakrishnan said that besides this age group, 42% of those infected with the deadly virus were those aged above 45 years."51% of people between the age group of 18 and 45 years have tested positive, while 42% were those above the age of 45 years."He said the issue was that those in the 18-45 age group who have tested positive go back to their homes and.