(Portland, OR)  --  A new report from Multnomah County health officials says Portland ranks fifth in the nation for the rate of syphilis cases.  The county health department says Portland averages about 250 cases of syphilis per year, and has seen an increase of about 15-hundred percent since 2007.  That year, Oregon registered about 30 syphilis cases, compared to about 450 so far in 2015.  KOIN-TV reports the Oregon Health Authority is launching an awareness campaign that will include ads on TriMet buses and an informational website.