Necropsy Pictures - Another Case of a Cystic Oviduct?

[jlwquilter]

Kissimmee/Orlando, it’s the same place in essence for those of us (me) that live in south Florida

 

[Tesumph]

To answer your question about Marek’s specifically, it is possible that there are carriers in your flock that are not necessarily showing symptoms but still shed the disease.
Due to the nature of how Marek’s replicates in the body, it can suddenly re-emerge in a bird several weeks or months later. It’s also characterized by chronic immune system suppression and would most certainly make symptoms of MG or IB worse.
There are varying degrees of how severe a strain can be, but there are certainly mild strains that would not wipe out a flock all at once like many horror stories we hear.

The benefit of getting definitive tests done is largely for your own peace of mind. I understand how insanely stressful it is to watch birds die and have no idea how to approach it.
It’s also for the future of your flock, and the steps you would take with introducing future birds. If it was Marek’s for example, you would need a strictly closed flock and tight biosecurity measures. If it’s MG and ovarian cancer, that might be a different story. Either way, at least you would know.