To each 'their own', said the old lady as she kissed the cow!I just don’t see any evidence resistance can be achieved through breeding.
It is such a common virus, that can lie dormant for years, be transmitted by wild birds, wind an so forth.
Those that claim to have resistant birds, in my opinion, simply have asymptotic birds that are actually shedding the virus like mad.
I really don’t care what others do, but I vaccinate and will continue too, if I ever hatch another bird.