I admire you tenacity but Merak's is a form of cancer, brought on by a virus akin to the herpes virus. While a bird survives Marek's ever now and again, the chickens that live, will shed the Marek's virus every day of it's life and remain unthrifty To me it just isn't worth the trouble doctoring a chicken that may go to be responsible for killing dozens and dozens of pullets and cockerels.