Every few weeks or months we hear of friends and strangers both through BYC and the general grapevine with serious issues like MG or newcastle's. That is usually followed by a flurry of phone calls and/or posts on the internet saying this and that but at the end of the day unless you are clean now and move to a bubble exposures will occur. So my questions are does anyone know of a reasonable screening protocal for people with moderate sized backyard flocks or small related businesses? What is worth culling your flock for? Other than basic quarantine and buying from people with good reputations can you protect yourself further? I have these same questions each time I become aware of someone with serious problems who is at least as cautious and careful anyone else. As a matter of individual responsibility it would make me feel good to know I was following some rational guidelines before exchanging or selling eggs or birds with other people in this wonderful hobby. BYC is a big enough cauldron of knowledge and communication that it would be a shame not to discuss a community standard for it's members, particularly those that regularly sell eggs or started birds.