text: In 2012, the incidence of<unk>  was estimated to be 6 million cases worldwide. From year 2005 to 2014, the incidence of<unk>  in the United States increased from 2.9 to 6.3 cases/100,000/year. The rate of reported cases increased by 15.1% between 2013 and 2014 in the United States.<unk>  incidence increased in every region of the Untied States in 2014, with the highest rate in the West and lowest rate in the Midwest. In 2012, the prevalence of<unk>  was estimated to be approximately 18 million cases in men and women aged 15-29 worldwide. The incidence and prevalence of<unk>  may be affected by age, gender, race, sexual behavior and geographical distribution.
option_0: Syphilis epidemiology and demographics
option_1: Neurosyphilis Epidemiology and Demographics
option_2: Typhus epidemiology and demographics
option_3: Cytomegalovirus epidemiology and demographics
option_4: Coronavirus epidemiology and demographics
option_5: Anosmia epidemiology and demographics
option_6: Drug allergy epidemiology and demographics
option_7: Alcoholism epidemiology and demographics