Bengaluru openers Salt and Virat Kohli began briskly, but the tempo dipped when Lungi Ngidi struck in his opening over to dismiss Kohli for 19 off 13 balls
Players and staff are staying in a restricted health environment for this year's IPL, which will be played across six venues in India, initially without spectators.
"His report from the second COVID test, came positive," the 2020 IPL finalists said in a statement. "He is currently in isolation at a designated medical care facility."
Participants will have to stay in restricted health environment for this year's IPL, which will be played across six venues, initially without spectators, from Friday.
England, trailing 2-1 in the series, need another 70 to make India bat again but face another quick loss after their two-day humiliation in the third Test at the same venue.