Your husband has fever of undetermined origin; it is so-called because the offending agent is yet to be determined. Because he is Mantoux positive does not mean that he has TB although that would be a possibility. He was probably exposed to TB organisms sometime in the past, hence the positive reaction. Patients with the fever of undetermined origin are and should be thoroughly investigated by a consultant physician in a hospital setting. These can be very complex problems but in most cases the cause is usually found by a stepwise investigation in a hospital. I would suggest that you should get your husband referred to and seen by a hospital consultant physician.