I am going to be vaccinating chicks very soon and I have never kept chickens but instead pheasants, guinea fowl and parrots. From what i understand the marek's vaccine has a live strain of the virus in it. A strain that effects turkeys. Will the chicks pose a threat to my other birds after they are vaccinated? The birds would not be near each other but marek's is very contagious so it seems worth being paranoid about especially for the parrots.