Ron, don't follow up when you really don't want to know the answers...I'm not sure I'm in the same camp with you on the workers spreading the virus from dairies to poultry farms. I personally think viral aerosol clouds from thousands of cattle are much more likely in most cases - that is probably how the infection spread dairy to dairy in California and CO. The feedlots may have played a role also, but no one ever did PCR or ELISA's on either feedlot cattle or big dairy herds for that matter. The respiratory infection in cattle is just not remarkable enough by itself to trigger testing when people don't want to test for it...People may also spread it, but the odds and numbers favor the cattle when they outnumber people 10,000 to 1. Regardless, God forbid we get persistent in testing either species when we don't want to know the answers! Just yell HIPAA or "confidentiality" and duck...

Back to poultry houses though; when chickens are infected and people are around, this virus is mammalian adapted enough that it's stupid to discount any possibility that people could carry it via aerosol for 24-48 hours, with or without symptoms. Just systematically test to assess the possibility! For the birds' sake!!