<s>[INST] My father is 82 years old and in good health.  Yesterday he had a fever (101) and experienced burning pain while urinating.  He went to the ER and they stared giving him antibiotics via an IV.  It's been 24 hours and his fever continues (101.7).  He said he feels terrible.  They just ordered an ultrasound of his bladder, kidneys and prostrate.  What could the problem be? [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Your father might be suffering from urinary tract infection. Urinary tract infections are very common in elderly males due to bening prostatic hypertrophy which causes urinary tract obstruction which leads to stasis of urine in bladder and urine is excellent media for bacteria to grow. I would advise you to get his urine complete examination done along with ultrasound kidney ureter bladder and prostate. In the meanwhile keep him on oral antibiotics preferably from quinolone group. Thanks </s>