<s>[INST] i am a 42 years female suffering from fever from 3 months left maxillary sinus was detected and operated as antibiotic was not effective. microbiology test shows AFB Negative routine culture shows Staphyloccus epidermidis organism.  But biopsy suggests turberclosis. pl suggest what i am suffering from [/INST] Fevers for 3 months and the biopsy suggest that it is tuberculosis. Staphylococcus epidermis is a bacterium commonly found on the body and doesn't generally cause symptoms like you have. There are other bacteria similar to TB that can cause such symptoms. These are also called acid fast bacilli (AFB). Routine cultures don't detect TB and these others. Special cultures have to be done that can take up to 6 weeks to show anything. The slide looking for AFB that you initially had is often negative even if the infection is present. That's why a biopsy and culture are necessary. Hope this helps. </s>