Tamil Nadu Chief Secretary K. Shanmugam has said the Covid-19 control strategy has now shifted from lockdown restrictions to containment management. In a letter to all the district collectors, he has cautioned that the cases may witness a spike in October if no discipline is observed now, as the economy remains opened up.  <br />''<br />''Meanwhile, the Covid-19 active caseload in the state has seen a marginal dip yesterday. It has come down to about 51.6 thousand with the recovery of more than six thousand and six hundred people. More from our correspondent:<br />''<br />''The state Chief Secretary K.Shanmugam has said the government driven testing, isolation and treating strategy in Covid-19 management is being replaced by the same initiatives driven by the public. In his letter to the district collectors he has emphasised that providing adequate facilities for testing and treatment both in private and government facilities should be the focus. He has asked them to be prepared to relocate Covid Care Centres from colleges to other places, as they are likely to be reopened in future.<br />''<br />''It is also stressed that close monitoring of biomedical waste disposal is important. Special teams are asked to be formed to monitor if safety measures are followed in offices and workplaces properly.<br />''<br />''The Chief Secretary has also asked the civic bodies and the police to enforce strict discipline saying the next two to three months are very critical in Covid-19 management as vaccines are not available yet. <br />''<br />