My husband has a enlarge prostate that's pushing on his bladder and he couldn't  pee so they put a catheter in him for a week because he's urine was backing up in his stomach then they had him to start catheterization him self and he got an infection in bladder he's been on 5 different iv antibiotics in the last two days in hospital his blood is better and he urine is better it was bright orange and cloudy looking still little orange but he keeps getting low grade fever every night so he can't  come till now fever for 24 hours  what would cause him to keep getting a fever at night