This French Public Health poster probably dates from the Thirties, when hard economic times led to an increase in prostitution and a corresponding increase in syphilis. The text was hardhitting:
"Defend yourself against syphilis. Don't expose yourself to infection, but if you already have it: to avoid spreading it to those near you, so that your children are not maimed, so that you yourself avoid becoming, sooner or later, BLIND, PARALYZED, ATAXIC or MAD. Start treatment right away from your doctor or at anti-veneral dispensaries. Ask the Ministry of Health for the list of addresses."