Except for one rooster who had the ocular form of Marek's, I haven't noticed any swelling of the area around the eye(s) in my chickens, but since most of them are silkies with
big, pronounced 'do's', it's amazing if I can see their eyes at all...lol !!! But seriously, the swelling clue makes sense if you think about it because in humans that skin becomes
puffy when...(discounting for those who have allergies or are chronic criers) we get puffy eyes when...what ??? We... 1. Don't get enough good sleep or rest, and/or 2. Don't consume a good, balanced diet (or DO consume a poor one ), and/or 3. Engage a stressful life or environment (some people prefer to say 'entertain' a stressful blah, blah, blah...instead of my use of the word 'engage'...but I just can't bring myself to use it like that because I, like all of us, have experienced some very stressful situations in my life and at no point during those periods did I find myself particularly 'entertained' by the events that created them nor would I ever consider them to be of a particularly 'entertaining' value, like a funny movie, per SE; therefore I use the word 'engage'...ahhhh, but I digress...). Anyway, it makes sense to me that if our Marek's chickens are engaging in numbers 1,2 & 3 (which they usually are if they're in the throws of Marek's), then they could potentially be getting their 'puffy eye syndrome' (PES) as a result of Marek's. Perhaps not directly, but most definitely in a roundabout way. Good call lalaland, it's always useful to have clear visual queues as to how our chicks are feeling !!!
P.S. To all of you who expressed your sympathies at the passing of my latest chicken...Ronnie. Your kind and supportive words brought a smile to my lips and a lift to my soul at a time when it felt as though nothing could lift it. Thank You !!!