I agree, also tight bio security! Have boots or shoes that are just for working with your flock. Coveralls help to. Always scrub down before going to feed or handle your birds! Really scrub well, and use anti bacterial, whenever you have been to another farm, feed store, or anywhere similar, and never never wear the shoes you wore shopping or visiting into your coop run or yard. 6 week, preferably 2 mo. Quarantine on all new birds going into flock. Never let other people into your coop or let them handle your chickens. If you show your chickens, the show chickens have to go through quarantine before they rejoin the flock. Cleanliness and common sense are important, and panic won't help. A little fear keeps one on his toes. Panic and extremes only hurt your birds. If your runs are clean and roomy and covered, there is no reason to lock them up. If you free range? Try to watch them and of course, the minute a bird acts a little off its feed, isolate them. If you normally don't have wild water birds coming and going, you should be fine. I have heard nothing about song bird populations being a threat. The only wild water bird to enter my yard was years ago, and it was a very young Mallard duckling scooped from his nest and dropped in our yard by 70-100 mile per hour winds that blew for 24 hours and took trees down in a corridor going west to east. I only saw the damage from St Cloud through Foley. Took 5 huge trees down in my yard (pulled up roots and all) and in the middle of all this mess this little ducking was walking wondering where he was. Though he didn't look injured he didn't last the night. I am sure he was chilled and in shock. I suspected he was 1-2 days old. Anyway, we have them fly over but pretty high up. They do visit the stream that runs through the woods and marshland that border the east and south property line, but my birds do not have access to that area.