Greeting cards, as funded by the San Francisco Department of Public Health. I fondly remember the "Syphilis 2004" campaign, complete with a cartoony penis and sores, but the web site appears to have gone away.
UPDATE: My memory is good, but my dates were bad. The cartoony penis was from the Healthy Penis 2002 campaign. An excerpt from the comic: "Syphilis sore? You told me you were a sales rep from Ohio!"