The district administrations are on high alert after 13 students of a government-run residential hostel in Hassan and seven medical college students, including an internee, tested positive for Covid-19, the health department officials said on Tuesday.

Following the detection of positive cases at the Morarji Desai hostel of Guramaranahalli village in Channarayapatna taluk of Hassan and Chamarajanagar Medical Sciences Institute have been sealed off by the authorities.