Klez.H.Worm infections

I am using inoculateIT 4.53 on my network, which is currently infected with Klez.H worm in its many varieties. I have the software configured to delete any infected files . This was what the people at CAI suggested because “..klez H is a worm and a worm cannot be cured..”
Is it true that a worm can’t be cured ony deleted , or can other products like macafee and norton CURE this worm ?