<prompt> Answer this question truthfullyCould you provide me with the context of this sentence? Is there anything specific you want me to change?  <response>: <reason> Neurosyphilis is not a common disease now because syphilis is usually treated early. In 2012, the incidence of syphilis was estimated to be 6 million cases worldwide. From year 2005 to 2014, the incidence of syphilis in the United States increased from 2.9 to 6.3 cases100,000year. The rate of reported cases increased by 15.1 between 2013 and 2014 in the United States. In 2012, the prevalence of syphilis was estimated to be approximately 18 million cases in men and women aged 15-29 worldwide. Among infected patients with Treponema pallidum only 3 to 5 develop neurosyphilis and 5 of those individuals develop tabes dorsalis, 1020 years later. 