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Hello. My name is***** and I am a veterinarian that can answer your question. I understand 4 of your latest chickens have become blind. Are you observing any other neurological signs such as head shaking, muscle twitching, lack of coordination of movements, etc.?
Thank you for that information. Differentials for sudden loss of eye sight in young chickens include heavy metal toxicity, bacterial/fungal infection, Marek’s Disease, Newcastle Disease, and salmonella. If it is Marek's Disease then you would expect to eventually see other neurological problems such as loss of mobility. Marek's Disease and Newcastle is only diagnosed based on necropsy. However, a blood test can confirm a heavy metal toxicity. Antibiotics for an infection. You can give them supplementary Vitamin E. Deficiency can cause a brain disorder called encephalomalacia. The dose of vitamin E is 100 IU/day for 3 days.
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You are correct. The neurological signs do not scream Marek's Disease and the vaccination program is encouraging. Hopefully it is not that. Please let me know if you have any other questions. All the best!