A nursing home patient is brought to the ED with complaints of fever and generalized weakness. Skin is warm, dry and flushed. The patient is mildly agitated - an abnormal situation for this patient. Vital signs are HR 110/min, respirations 26/min, and temperature 101.8° F (28.8° C). A Foley catheter is draining cloudy yellow urine. You suspect this patient to have which of the following?