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Do you have other birds who are vaccinated? It is my understanding that the Marek's vaccine causes the bird to 'carry' the virus, meaning they will shed it their entire life. If you have other birds who are vaccinated and choose to not vaccinate others, the ones not vaccinated could catch the disease from the vaccinated birds.
Do you have other birds who are vaccinated? It is my understanding that the Marek's vaccine causes the bird to 'carry' the virus, meaning they will shed it their entire life. If you have other birds who are vaccinated and choose to not vaccinate others, the ones not vaccinated could catch the disease from the vaccinated birds.