[salan]

It's funny how people seem to fall into two camps on this. Either 'it's the plague destroy it and everything around it'.
or 'so it's a bit of fungus' so what?
I have had a 200mm lens that I got for nowt because it had some fungus in it. I cleaned it and have had the lens for ten years now and no signs of any anywhere else or back on the lens.
As has been said. The spores are around us every day (don't I know it, I am allergic to them!).
I think each case has to be looked at and decided upon. If it was a bad infection and it was a 'common lens' and not expensive, then I would right it off. But if it was an expensive lens or rare, then I would get it cleaned/clean it myself.
Alan