But are you sure this is Marek's? were any of the dead birds necropsied and confirmed to have marek's? Because it seems whatever they have is progressing very rapidly and could be something else altogether, and possibly you are treating them with the wrong antibiotics.
I am reading a lot about St john's worth, turmeric, silver, etc and i have to say my intial (and superficial!) conclusion is that these immune boosting/anti inflammatory natural methods are probably helping birds that do not actually have marek's, and instead have some minor ailment with similar symptons. Still worth keeping in the cupboard of course..they don't seem to harm, and only do nothing at worst.
I am reading a lot about St john's worth, turmeric, silver, etc and i have to say my intial (and superficial!) conclusion is that these immune boosting/anti inflammatory natural methods are probably helping birds that do not actually have marek's, and instead have some minor ailment with similar symptons. Still worth keeping in the cupboard of course..they don't seem to harm, and only do nothing at worst.