Your husband shouldn't be visiting your friend at all. MRSA is an infection and can be spread to others. Anyone who enters the hospital room should wear an isolation gown, gloves, and a mask.
My his husband and I went to visit friend in hospital we found out she has merser my husband is going through chemo what should we be doing to prevent him from catching this?
He's already been exposed to it, so there's really nothing you can do but hope he didn't get it. I'm really surprised the hospital didn't make you gown-up before you went into their room.
I would tell your oncologist the details of that visit and let him evaluate the situation.
It is highly contagious, but whether it is likely your husband might have contracted it depends on the patient and what your husband did while in the room.