You have been assigned to observe with Ms. Robeerts, the charge nurse on Medicine 3B. One young man, James Donaldson, who is obviously ill. Ms. Roberts tells you that his temperature is 102 degrees. He has a severe headache. There is no indication of a site infection. A final diagnosis has not yet been made. The attending physician, Dr. Sampson, comes by to see the patient and says, "I'll give him a prescription to make him more comfortable, but let's not start antibiotics for 12 hours." Analyze this information to explain the order.