<span style="color: #222222;">In Chennai, the second phase of the sero-survey on Covid-19 has been launched today.<br />'' <br />'' The Tamil Nadu principal health secretary Dr J Radhakrishnan told reporters, it will be expanded throughout the state in the next ten days.<br />'' <br />'' Meanwhile, the active Covid caseload in the state has further dipped to 44, 437. The total mortality crossed ten thousand today.<br />'' <br />'' AIR correspondent reports, the sero-survey helps determine the magnitude of the exposure of the public to the SARSCoV-2 virus that causes the pandemic Covid-19.<br />'' <br />'' In Chennai, the second edition of the survey is being focussed on hutments where the population density is more.<br />'' <br />'' The health principal secretary Dr Radhakrishnan while talking to reporters expressed concern that there is an overall complacency among the public in wearing face masks which he warned would spoil the gains reached in controlling the pandemic due to the relentless efforts so far.<br />'' <br />'' The Chennai Corporation Commissioner Praksh said nearly 20 percent of the city population have been tested for Covid-19 using the RT-PCR kits.<br />'' <br />''<br />''The total number of tests so far in the state capital is inching closer to 16 lakh and the officials are planning to further intensify the testing. </span><br />