Thrush as symptom of Cushings?


--Is thrush sometimes a symptom of PPID?  I have a 32 year old horse that I am beginning to suspect has Cushings.  I have held off testing him because he has no other obvious symptoms, but I am beginning to wonder if his tendencies toward thrush may not just be my poor attention to cleaning his feet. 

I know that there are a lot of miscellaneous issues in PPID horses related to lowered immunity.  Could  a predisposition to thrush be one of them?  
Gail Russell 8/30/2008 .

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