HI Thanks for posting your query. Most common cause of fever is Infections. Infection can be due to Virus , Bacteria or Fungus . But a fever of 2 months indicates a Bacterial infection rather than Virus or fungus. The treatment for bacterial infections is Antibiotic. But not all antibiotic works on all Bacteria. So we need to find which bacteria has infected you and according advise the right antibiotic. The tests what have been done is not complete. I would recommend you to get the following tests done and revert back . Complete Hemogram, IgM Leptospira Antibodies, Chest X ray, Blood culture sensitivity , Brucella Antigen test, CRP, ANA Hope this information was useful to you. Any clarifications feel free to ask .