I would set up rules about allowing people in your brooders or pens or even pastures. Will Marrow has very strict biosecurity as he lost a ton of birds and $ when someone introduced something into his flock by visiting. When I visited I showered and wore clothes and shoe's that had never been out with my flock. You have to be very careful about this type of thing with birds. I am sorry about big boy and hope things staighten up for you soon.
Good Luck,
Henry
Good Luck,
Henry