My dad is having fever for more than 12days. From morning to evening he is ok, but in evening or night he felt cold and temperature reaches 102+. We have already test his blood and urine for dengue, typhoid and etc as per local doctors suggestions, but all the reports are normal. But can't see any sign of disappear of his fever. Now we are already too tensed as it's almost 13days. I am from Durgapur, West Bengal. Please suggest what to do next.