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there are other illness that can be passed to your birds too. But most of these can be passed by all kinds of means even a visit to the feed store can bring back the virus.
All kinds of bio security measures are discussed in most of the indiana poultry literature and the purdue sites. I would look into those before deciding to even ask if you want to see her flock. Honestly I don't let just any stranger come see my flock now days. The person coming might bring my birds some sickness. It does not mean that I don't have great birds in a great set up. It is just a method I use to limit exposure or risk. Some bio measures are a bit extreme while others are common sense.
http://www.inpoultry.org/biosecurity.cfm