“…Following the demonstration of spirochaetes in the urine of cases of so‐called abacterial pyuria (Coutts and Vargas‐Zalazar, 1946), and noting the association of this condition with a urethritis (Horne, 1950), some workers have considered a spirochaetal cause of non‐gonococcal urethritis based on the finding of spirochaetes similar to those found in the mouth. It has been suggested that the practice of anal or buccal coitus may be responsible.…”