The complete lockdown in Madurai in Tamil Nadu has been extended for two more days till Tuesday night. The State administration has said in a statement, the decision has been taken to screen more people through the ongoing fever camps so that the intensity of the COVID-19 spread could be reduced. <br />''<br />''Meanwhile, the State health department has said, an order for the purchase of 43-thousand 'finger pulse-oxymeters' has been placed. The number of COVID-19 affected people in the state has crossed 1,38,000 with 4,244 people confirmed positive today. <br />''<br />''AIR Correspondent reports that though there is apparently no reduction in the everyday figure of COVID-19 cases across Tamil Nadu, Chennai is witnessing a remarkable improvement in the overall situation. The number for the past few days in the State capital is hovering around 1,200 which was earlier fluctuating around the figure of 2,000. <br />''<br />''Dr Kolandasamy, a medical expert and former Director of the State Department of Public Health says, there are signs of Chennai developing herd immunity, though he warns that it should not lead to complacency among the people. He insists people continue to wear masks and follow social distancing. <br />''<br />'' He said, "In Chennai, the herd immunity has started improving. So the infection will start declining. And it will come to complete control by the time the herd immunity reaches the 60 per cent of the population."<br />''<br />''<span style="color: #222222;">Now the challenge lies in sustaining the downward spiral and also in curtailing the momentum of the infection spreading outside the capital city. </span><br />