Is Perferin Important for Clearance?

I thought perferin was important for clearance, perfrine is important for clearance by sodotoxic tea cells. So why is it when you knock out perfer and then the virus is cleared? I mean, i understand it's now no longer killing these cells, but what is clearing it? At so that was a complicated system where we had a mixed chimera. We hadn't o. Oagot it. It's almost saying, i'm sorry, i'm trying, but thes people, they may kill. I can't help.