Hello dear, Thank you for your contact to health care magic. I read and understand your concern. I am Dr Arun Tank answering your concern. Your father is suffering from the typhoid fever. Widal test is diagnostic test used for the typhoid fever so you are having this infection. Though the ELISA test for TB is not having a good value your test is coming negative. So your father is having negative result for TB. I suggest you to start treatment with oral ciprofloxacin. There after culture and sensitivity of the stool and blood for S.typhi is necessary as drug resistant bacteria is growing in some patients. Taking drugs there after the culture report prevent relapse and cures your father completely. Please eat healthy high protein and high carbohydrate diet. Avoid eating heavy diet at once. Instead eat small frequent diet. It will prevent the intestinal ulcer to become perforated. I will be happy to answer your further concern on bit.ly/DrArun. Thank you, Dr Arun Tank Infectious diseases specialist, HCM.