<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have a question my grandson who is 12 years old. He have symptoms of high fever 102 to 103 for 3 days, low white blood count, dehydration, nausesa, headaches, no energy and no appettite and diziness. One doctor thought he had appendicitis but a cat scan did not show anything. One doctor said he has a infection, but did not give him any antibiotics. What should we do?  <response>: Hello and Welcome to Ask A Doctor. I have read your query and here is my advice. Sometimes a low white blood cell count can be due to a viral infection and last for a couple of weeks. There are other kinds of germs that cause low white blood cell count. These include bacteria, fungus, and germs carried by ticks. When these ticks bite a human, heshe becomes infected. Your list of your grandsons symptoms is worrisome. Because a high fever with headache could possibly be due to meningitis which is a MOST serious infection of the coverings of the brain. I strongly urge you to take him for medical care, perhaps this time to an emergency room right away! Hope I have answered your query. If you have any further questions, I will be happy to help. Arnold EDD, MD, FLAP 