I bought 1500 of the 2800 today, as I think the near 10% drop in the week is overkill... that said maybe should have waited to see what happens when the China markets open on Monday.
I'm buying for the long term, so if there is a continued fall in the coming weeks I will see it as an opportunity to add more (in perhaps larger quantities than I have bought today).
I agree with the poster above that flu viruses kill hundreds of thousands each year, I understand the need for vigilance in case this particular virus does evolve into something more potent, but with what we know today I feel there is an element of hysteria.
Obviously I hope that I am proved right with this (from a human perspective more than investment).