I have had many over the years. Somehow I contracted Pseudomonas in 2012. I didn't look sick even though I knew something was wrong. I was born with asthma and all the Dr's kept telling me it was a problem with my asthma but I knew that it was not. I finally was referred to an Infectious Disease Dr by a Pulomonologist. Infectious Dr listened to me answer questions and tell him what I felt in my chest and he just knew what it was. He did spetum cultures and he was correct. But by the time it was diagnosed , a year later, my lungs were almost shot. All of my silica are either deformed or destroyed inside my lungs. I can no longer move mucus through my lungs therefore it sits there and becomes a magnet for bacteria. I pick up bacteria from dirt, water, or dust. So pretty much the entire environment is a problem. In addition I have Bronchitcitasis which causes the small breathing tubes inside the lungs to scar and become enlarged because of so many past infections. As you can see it is so important to catch medical issues early. I have had MAC, MAI, Burkholderia, Stenotrophomonas, and many more. They are all serious and hard to treat. Good luck in finding what is causing the fever. All of these bacteria do that to me and signals me to start getting spectrum samples to the DR. It takes time for the lab to grow them out and decide what drug will treat it. Of course, your problem could be totally different but still needs to be figured out. Wishing you luck in finding a good and knowledgable dr to help you.