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Sexually Transmitted Diseases (STDs) in the U.S., 1941–2004

More than 25 diseases are spread primarily through sexual activity. The latest estimates indicate that there are about 15 million new sexually transmitted disease cases in the United States each year. Approximately one-fourth of these new infections are in teenagers. Nearly two-thirds of all STD cases occur in people younger than 25 years.

Year	Syphilis	Chlamydia	Gonorrhea	Chancroid
1941	485,560	n.r.	193,468	3,384
1950	217,558	n.r.	286,746	4,977
1960	122,538	n.r.	258,933	1,680
1970	91,382	n.r.	600,072	1,416
1980	68,832	n.r.	1,004,029	788
1990	135,590	323,663	690,042	4,212
1995	69,357	478,577	392,651	607
2000	31,618	709,452	363,136	78
2004	33,401	929,462	330,132	30