Can CD fungus spread?

Yeah that's right, fungus. I've got 2 discs with these wierd squiggly lines on them, that at first I thought was just disc rot, but tturns out to be a fungus that can eat through CDs. What I fear is that this could, or already could have, spread to all of my other discs, due to the fact that I'm keeping them in the same drawers. Some of the other discs I have also have small pinholes, some of which have small stringy lines coming from them. The room I store them in never goes above 40% humidity, and they are in dark drawers with a silica gel in them.

The discs look like the pictures shown, but not as bad.