Coryza is transmitted through direct contact, airborne droplets and contamination of drinking water. *I* wouldn't feel great about bringing in new birds with their infected flock being just 200ft away from yours. The typical remedy is an all in, all out cull. Since they've kept their infected birds, and added new chicks, they're building a flock of birds that are unhealthy and carriers of a chronic disease. You can vaccinate for coryza.
Their chicken friend is correct, coryza is a respiratory illness, an acute respiratory illness. You might explain to your neighbors that chickens do not get colds though, they get chronic respiratory diseases that they carry for life. And, as carriers, they can transmit that illness to other birds even while appearing healthy themselves. And, of course, they can relapse back into illness with any little stress and their nightmare will start all over again. No matter how many new chicks they buy to replace the ones that succumb.
If they were my neighbors, I'd go onto Google, print out an overview on infectious coryza (and respiratory illnesses in chickens in general) and present that information to them (and maybe they'll show it to their chicken friend and everyone can educate themselves a little).
I'm so sorry, this is a horrible situation to be dealing with. Especially when the (most likely) responsible party doesn't want to
And start over next year.
Minus $200 a month income, and buyin eggs and chicken from the store. Yuck.
Edited by raeleigh26 - 3/31/16 at 4:07pm