The Ayrshire club has not been far from the virus headlines in Scottish football, having been forced to postpone games earlier in the season after an outbreak in the squad and exiting the Betfred Cup group stage as a result.
That also led to an SFA charge for breaching protocols which the club successfully appealed.
Killie are waiting to play the game missed and initially awarded to Motherwell as part of the club’s punishment.
The latest positive cases were confirmed in a club statement, but the club will play St Johnstone as planned after taking guidance from the Scottish football joint response group.
"They are satisfied that all protocols have been followed,” the club said. “All other squad members and staff tested yesterday (Thursday) have returned negative results.
"We wish those affected a speedy recovery.”