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**oral sex
==Pathogenand disease=====syphilis===*''Treponema pallidum''**one of 3 major spirochaetes - leptospirosis and borrelia*6 mil. new cases/2018*higher in female sex worker and MSM*diagnosis**non-treponemal - positive during active stage; sensitive, not specific***VDRL***RPR**treponemal - positive for lifelong; specific, not sensitive***TPHA***TPPA***FTA {|class="wikitable"!!non-treponemal positive!non-treponemal negative|-!treponemal positive|active syphilis|past syphilis|-!treponemal negative|other active disease|nothing|}
==Epidemiology==
