If my uncle and I have a joint checking account, will my personal accounts be at risk if my uncle applied for Medicaid?

I am listed as a joint account holder on my uncle's checking account. I am paying all his bills but he still has access to his account. All the money in the account is his and his social security checks are going in it. My concern is, he is going to have to spend down and apply for Medicaid for nursing home care. Does this put any of my personal accounts at risk since I am listed as a joint account holder on his?