Debbi, if you do whole flock test here it is good for one year. The second year if you have under 300 birds you have to do all in the flock. The first test is $15 and each year after it is $5. We used to get an NPIP book every year but have not got one recently for some reason. Do not know if it is worth the time but is something Uncle say has to be done to show chickens.Don, Please explain to me how this all works. From what I gather, once tested and found free of diseases, the flock is good for one year? If this is the case, here is the scenario I don't quite get. Ok, flock tested, all birds are clean, and you get your NPIP #. So a month down the road, some neighbor's infected chicken finds it's way into your yard, and passes on his illness. You of course have no idea, so you are still selling NPIP certified stock and eggs. The disease spreads and chickens die and everyone is wondering why. Do you see my point? How is this number and piece of paper supposed to protect the birds and clients? I know it all has to start somewhere, but to clear a flock for a year seems to me to be asking for this type of scenario to happen. Just my thoughts on the matter, not trying to stir the pot, but would just like to know if this is all really worth the time, effort, and money??