RT Journal Article SR Electronic T1 Demonstration of a virus-like agent contaminating material containing the Stockholm substrain of the Nichols pathogenic Treponema pallidum. JF The British Journal of Venereal Diseases JO Br J Vener Dis FD BMJ Publishing Group Ltd SP 435 OP 440 DO 10.1136/sti.46.6.435 VO 46 IS 6 A1 H Gudjónsson A1 B Newman A1 T B Turner YR 1970 UL http://sti.bmj.com/content/46/6/435.abstract AB