Hidear Sir, My younger brother got typhoid fever in 2014 and it cured and he was fine but time to time he gets fever whenever he takes bath with cold water, on 07-12-2015 he got fever with head ache, chest pain, loose motion, he rushed to a doctor nothing was found in blood sample, urine test and ultra sound test for chest. Kindly advise me what is this. Why it happens, he is living now NCR Delhi (Haryana cold affected area) he has cold also since more one month.