I might eat the birds with resp. symptoms only but my birds had infection and/or lesions on their organs...no way I'm eating that.
It's hard to say when your flock will be safe. Different diseases can live without a host for different amounts of time. Some viruses can live on cotton clothes or even in your nose hairs for hours to days and be carried around. Clean up all poo and bedding from the culled birds, bag or burn. Wash everything you can and give a bleach water rinse...spray the coop with bleach water and let dry too.
Went on the steam train in Laona this weekend. Friends of ours were camping there with their horses and 'robbed' the train several times....the kids loved it, lots of shooting, yelling, horses rearing. If you have kids I'd recommend going on a 'robbery' weekend but adults who are into trains and/or our logging history would probably enjoy it any time. They have a very nice museum and the engine is the only one of it's kind left and is 100 years old this year.
http://www.lumberjacksteamtrain.com/