I have 3 perfectly healthy hens. And I heard about vaccinations for chickens and diseases that infects them and even cancer for chickens. I just wanna asked some questions about vaccines. (I'm getting 2 new baby chickens next year) 1.How much do they cost? 2.Where you buy them at? (Can't find any vaccinations at my local chicken shop) 3.Do you need a vet to do it or is it a DIY job? 4.What exactly is Marek's Disease? Is it a tumor or cancer cells? 5.Should my hens be vaccinated? 6.Can chickens get the cold or flu virus from humans? 7.If vaccinating your chickens is a DIY job, then how do you do it? 8.Is all your fowls vaccinated and is it hard to vaccinate them? Like do you have to wear gloves? 9.Number 9 is just tell me all about vaccines for chickens and what type are they.