### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
First off I have a bone disese called fibrous displaysia. aboiut a year ago I had major surgery to scrape a a large portion of cystic material in my right femur. then they had to inset a largde rod in the middle of my damaged bone and secure with 3 largenails. While in hospital from surgrey i developed pnuemonia and had an 8 day stay instesd of 2. I have been assuresd this is in no wat linked to cancer. About a month ago I was having a lot of pain in this leg. more than Dr. thought I should have. oddly enough when I went to see DR. I was on a course of antibiotics for broncitus. He decided to take blood to check for bone infection. Called back and said white blood cell count was prettyhigh, but was nothing to do with any bine issue. At that time my count was 20,000. Followed up with family dr. Two weeks ago blood count had dropped from 20 to 13,000. Family dr. thought that was good sign but wanted another full blood panel. Blood test yesterday came back at 16,000. What are some of the things would cause this sort of flucutuation? even though it is up down and now back up......any suggestios on what might cause this to happen?

### output:

Hi I am Chat Doctor. .  Actually a lot of causes could have caused such fluctuation but the main role of increased WBC counts is infection, when bacteria are in your blood stream your body defense mechanism produce more WBC to withstand and attack the bacterial cells.  Your immune system may have been affected by the treatments you have been using as some medications like antibiotics and steroids may interfere with the blood counts.  I don't think you should worry about the fluctuation I think you should worry about the source of infection causing WBC production by your immune system and the 