Currently, over 1,800 prisoners are lodged in the jail, the official from Thane Civil Hospital told reporters on Monday.
All the jail inmates were recently tested and the results of 30 of them came out positive for coronavirus, he said.
They were admitted to the Thane Civil Hospital on Monday, he said.
The Kalyan-Dombivli civic limits on Monday reported 1,551 new cases of coronavirus, raising the tally to 1,07,584, while seven more deaths pushed the toll to 1,329, as per official figures. PTI