Hi there.. please get blood culture and sensitivity done once so that we know whether it's typhoid or other infection which is not responding to monocef... until then have fluids well , have nutritious food, foods which can build your immunity, rest well. Continue multivitamin tablets.. 99.5 is actually fine nothing to worry.. fever not responding to monocef could be malaria, tuberculosis, UTI.. if blood culture shows no growth then other causes have to be evaluated for..