<s>[INST] had severe urinary infection with high fever on 14th Feb and on CT Scan found stones in tube had laser operation and stones removed but till date fever persists.  What could be the reason for the fever and chills. All test taken No Dengue,Typhoid,Malaria. CBC shows infection [/INST] Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Fever is quite common after removal of renal stones because of subsequent infection following the procedure. Start antibiotics preferably Ciprofloxacin and do blood and urine culture and change antibiotics accordingly. As of now you can take Paracetamol for fever. Drink plenty of water to keep your self hydrated. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Shinas Hussain </s>