The University of Georgia's poultry dept. went above and beyond for me, too. I am glad that they are helping you.
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You cant sell nor give away eggs for hatching neither. MG is transmitted through eggs which can infect someone elses flock(s.) Additionally it can be carried on your clothing, shoes, hands etc....you must maintain a closed flock and practice strict biosecurity if you decide to keep your birds. Personally I'd cull, disinfect everything, and start over in 6-7 months since you suspect there might be something else going on.