Very glad your husband is getting to the end of treatment, good luck with the rest of it, hope he has a full uneventful recovery yet, your family has really had a rough time.
Finally you at least seem to have gotten an answer on the birds. Yikes with the meds. You are dealing with Mycoplasma gallisepticum? If you keep the current flock and treat, what did they say about the possibility that some would still be silent carriers, giving you a problem if you bring in new birds later? Would any other tetracycline meds work? or if you could treat a smaller number by hand?
x2
Treated surviving birds WILL be carriers. The carriers will infect incoming new birds.