<s>[INST] hi..my husband has been having continuous fever for last 5 days..its gets better with paracetamol but returns back to 102-103 as soon as paracetamol wears off...other symptoms are chills,rigors, running nose, body pain, and extreme weakness...his blood counts are normal...and blood culture is negative for malarial parasite as well as typhoid..can you  suggest me some diagnosis?? [/INST] Hello there, If the usual causes of fever like sore throat, UTI, malaria are ruled out then the diagnosis left is viral fever. Viral fever presents with the symptoms that you have described and causes extreme weakness. It wears off in 1-2 weeks and all you have to wait it out. Please give your husband plenty of fluids and paracetamol 500 m.g thrice a day. Hope this helps, I would answer any further queries if you have any. Chat Doctor.  </s>