PUO is fever
who's cause is not been able to find out.
But most common diseases, especially in Indian set up, is Typhoid
It is important to rule out TB with certainty.
Need not be pulmonary T.B, extra-pulmonary TB can also present with TB.
invasive tests like FNAC, bone-marrow examination, may have to be done to come to a diagnosis.
Treatment need to be given accordingly.