Your right
There is a high likelihood that the wild birds are bringing in a lot and that your visits to other chicken properties is also a source.
I would remove whatever is bringing in the wild birds and either stop going places with other chickens or plan on spraying shoes and lower pant legs with lysol (or another germ killer) before even getting in your car. Then fully change clothes as soon as you get home and scrub down.
Seems easier to just not go where other chickens are to me.
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