Chancroid was endemic worldwide until the 20th century, but is now most common in the Caribbean, Africa, Asia (except Thailand), and Latin America. There were an estimated 7 million new cases in the world during 1995; however, due to difficulties in diagnosis and reporting, the true number is unknown. The prevalence of chancroid has significantly declined in some countries, which is thought to be due to the therapeutic syndromic management of genital ulcer disease and significant social change. In the US, the prevalence peaked in 1947 with over 9500 cases and has since declined dramatically. In 2018, only 3 cases of chancroid were reported in the US.
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