Official websites use .gov A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Periodical. Andrewes, C. H. "Is Sex Infectious?" St. Bartholomew's Hospital Journal 57, 6 (June 1953): 149-151. Article. 4 Images.. St. Bartholomew's Hospital Journal