- May 21, 2017
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Thank you for the links.I am not saying it does not have Maraks. More birds have Maraks than most people think.
I would not diagnose that as Maraks based solely on that pupil. Other things can affect a chickens eye. Injuries are common.
The only sure way to tell if it’s Maraks is a necropsy.
I don’t worry about Maraks anymore, my birds are all vaccinated. And I am almost bird free, my last 18 should be gone by fall.
https://www.birdhealth.com.au/causes-of-eye-and-respiratory-symptoms
https://ucanr.edu/sites/poultry/files/246963.pdf
Though they don’t seem to disprove that a pinprick pupil with a gray ring around it is a symptom of Marek’s.
I understand that the only way to be sure is through a necropsy, but that’s the case with a lot of infectious poultry diseases, as is noted in the first link. However, as far as I am aware, the sudden development of what the hen pictured displays isn’t credited to anything else other than ocular Marek’s. I’m also basing my thoughts upon pictures I’ve seen of confirmed and unconfirmed ocular Marek’s that showed chickens with that same particular symptom.
I am pretty sure my own flock has Marek’s due to multiple unknown deaths in the past coupled with a rooster I had that became paralyzed and wasted away.