Thanks for giving very good information about fever. Recently my baby which is 9 years old from fever from last 21 days. fever reach up to 103-104. when i give her paracetamol 250mg. 10ml dose it take to two hours for normal body temperature. But if fever is 100-101 it became normal within 1 hour. i done all tests like CBC, WIDAL , JAUNDICE, CHEST XRAY , SONOGRAPHY , JAUNDICE, ESR, MALARIA, ETC. all reports normal. even blood culture is normal. i done all this taste 5 times. i change 4 docotrs. but they did not come on any decision. i admitted for 6 days. yesterday dischaged her. from last night to till evening 3 times fever came. 7;15pm, 11;15 pm , 4;00 am, 4;00 discharged from hospital. Only one time WIDAL reports positive after 10 days of fever but after that reports shows NO WIDAL. she is suffering from 19th February 2016. In the beginning 3 days she had vomiting and pain in belly. after three days fever starts. So, can you suggest any test or any other diagnosis based on your experience. I am from Ahmedabad,Gujarat. It is possible about Typhoid.