<prompt> Renal calculus seen in proteus infection isUric acidXanthineTriple phosphateCalcium  <response>: Urease producing organisms eg :- proteus ,psuedomonas , and staphylococcus , break down urea to produce ammonia and co2.The urine becomes alkaline which promotes formation of struvite calculi magnesium ammonium phosphate which grow to become staghorn calculi.E coli never forms struvite stones ref :- Bailey and Love 27th edition .chapter 72 . pg no 1406 