I think it might be worth trying to get an idea of the original vector if possible. I attempted attempted to post a survey about this here, but it was rejected, though I think poll that spurred this post. We've gotten 38 responses with only unofficial advertising; it would be more useful if we could get it publicized to everyone who was affected.

http://cosmos.phy.tufts.edu/~kdo/Arisia-virus-survey.html