<span style="color: #222222;">Amid the graded relaxations announced by the government, the Principal Scientific Advisor, Dr K.Vijay Raghavan has asked people to develop habit of maintaining proper hygiene, wearing mask and follow social distancing.<br />''<br />''He said everyone must download Aarogya Setu App in their mobile phones so that further spread of the virus could be checked.</span><br />''<br />