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There are certain birds more prone to it. What I've been told is that most birds after a certain age, like age 1-3 depending on species, develop a natural immunity to it and are out of the danger zone for getting the disease. Other birds can be natural carriers for it, so until they are of a certain age they are considered a risk factor for it. While other birds, like caiques, are always always always at risk for it, they never develop the proper antibodies and natural immunity to it, so they have to be vaccinated for it as babies and into adulthood. Other birds, once they've been vaccinated as chicks, they are OK for life.
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