Tamil Nadu never announced any relaxation in following COVID-19 appropriate behaviour and it is safe to wear a mask in crowded places, state Health Minister Ma Subramanian said on Sunday amid a surge in coronavirus infections overseas. The minister said health department officials have been instructed to mandatorily take RT-PCR tests of all the passengers at the international airport who arrive from countries where the spread of infection has been high. Beginning Saturday, Tamil Nadu has resumed random testing of international passengers arriving at the airports in the state. ''Wearing a mask, hand hygiene are already covered under COVID-19 protocols....