Here are some helpful links to find out more about STI's in general and more about syphilis as well:

http://ppt.on.ca/userfiles//syphilis.pdf

http://search.toronto.ca/search?q=syphilis&spell=1&output=xml_no_dtd&ie=UTF-8&client=Toronto&proxystylesheet=Toronto&site=TorontoWebsite&access=p

http://www.toronto.ca/health/pdf/syphilis_update.pdf