"I'm afraid we have had three of the boys out with it," Gorman told Sky Sports News.
"Mikele Liegertwood had it and he has just come back into the squad last week, Peter Ramage, and our goalkeeper right at the very beginning of the season was out with it as well. So the lads have done really well to recover and it's back to business again.
"Even our physio had it, it's one of those things that is going around and you just have to control it, let's not make a big fuss of it.
"I think we have handled it well and the lads are back now."