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PCR testing is for the DNA from the Marek's virus. They can take a scant amount and create a bigger amount that's capable to be read. I know that there are pre-requisites for a Marek's diagnosis: namely tumors, histopathy, and DNA. DNA testing is for exposure, but to say that the bird died from it means there has to be tumors present. Out of the 5 necropsies I've sent, 3 have been in my fridge for several days and there was no problem. I put them in a cooler with those ice paks . I would imagine that there are some ailments that would need to be examined fresh.
Prior to my first sent necropsy, Nambroth and Casportpony gave me a lot of good advice. I was so nervous sending the first one! And one actually got sent with 20 ml of vodka in the crop and a partially decapitated head.