My chickens have been my best pets since forever, and having lost a hen to fowl pox earlier, I have decided that I want to vaccinate the rest against it, especially my two new eight week old pullets. But for a few more dollars I can buy a vaccine for fowl pox and avian influenza. Should I vaccinate them for that? Is it effective in preventing the avian flu? Will it actually protect them from it or just make the symptoms less noticeable if they do catch it(like I heard someone say once). I just want my birds safe, and I wonder of I should go for it.