Table 34. Primary and Secondary Syphilis — Reported Cases and Rates of Reported Cases by Age Group and Sex, United States, 2014–2018

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Year Age Group Cases Rates per 100,000 Population*
Total Male Female Unknown Sex Total Male Female
2014 0– 4 0 0 0 0 0.0 0.0 0.0
5– 9 0 0 0 0 0.0 0.0 0.0
10–14 12 4 8 0 0.1 0.0 0.1
15–19 1,023 761 262 0 4.9 7.1 2.5
20–24 4,137 3,632 503 2 18.1 30.9 4.5
25–29 4,092 3,727 361 4 18.6 33.4 3.3
30–34 2,887 2,635 248 4 13.4 24.4 2.3
35–39 2,045 1,868 177 0 10.3 18.8 1.8
40–44 1,758 1,654 103 1 8.5 16.2 1.0
45–54 2,966 2,830 135 1 6.8 13.2 0.6
55–64 897 860 36 1 2.2 4.5 0.2
65+ 176 169 7 0 0.4 0.8 0.0
Unknown Age 6 6 0 0      
Total 19,999 18,146 1,840 13 6.3 11.6 1.1
2015 0– 4 2 0 1 1 0.0 0.0 0.0
5– 9 1 0 1 0 0.0 0.0 0.0
10–14 9 1 8 0 0.0 0.0 0.1
15–19 1,148 865 283 0 5.4 8.0 2.7
20–24 4,766 4,186 573 7 21.0 35.9 5.2
25–29 5,168 4,671 491 6 23.0 40.9 4.4
30–34 3,549 3,234 311 4 16.4 29.7 2.9
35–39 2,482 2,249 229 4 12.2 22.1 2.2
40–44 1,897 1,744 152 1 9.4 17.4 1.5
45–54 3,488 3,294 190 4 8.1 15.5 0.9
55–64 1,153 1,099 54 0 2.8 5.6 0.3
65+ 207 202 5 0 0.4 1.0 0.0
Unknown Age 2 2 0 0      
Total 23,872 21,547 2,298 27 7.4 13.6 1.4
2016 0– 4 2 0 2 0 0.0 0.0 0.0
5– 9 2 1 1 0 0.0 0.0 0.0
10–14 15 6 9 0 0.1 0.1 0.1
15–19 1,298 957 340 1 6.1 8.9 3.3
20–24 5,172 4,418 744 10 23.1 38.4 6.8
25–29 6,177 5,538 624 15 27.0 47.6 5.5
30–34 4,278 3,806 464 8 19.6 34.7 4.3
35–39 3,043 2,729 311 3 14.6 26.3 3.0
40–44 2,140 1,944 193 3 10.9 19.9 1.9
45–54 3,953 3,691 261 1 9.2 17.5 1.2
55–64 1,418 1,338 80 0 3.4 6.7 0.4
65+ 279 269 10 0 0.6 1.2 0.0
Unknown Age 37 27 10 0      
Total 27,814 24,724 3,049 41 8.6 15.5 1.9
2017 0– 4 5 0 5 0 0.0 0.0 0.1
5– 9 1 0 1 0 0.0 0.0 0.0
10–14 20 6 14 0 0.1 0.1 0.1
15–19 1,421 1,092 327 2 6.7 10.1 3.2
20–24 5,580 4,728 848 4 25.2 41.7 7.9
25–29 6,838 6,033 795 10 29.3 50.7 6.9
30–34 4,870 4,313 549 8 22.2 38.9 5.0
35–39 3,580 3,145 431 4 16.9 29.6 4.1
40–44 2,290 2,005 282 3 11.7 20.6 2.9
45–54 4,091 3,753 334 4 9.7 18.0 1.6
55–64 1,586 1,468 117 1 3.8 7.2 0.5
65+ 349 329 19 1 0.7 1.5 0.1
Unknown Age 13 13 0 0      
Total 30,644 26,885 3,722 37 9.4 16.8 2.3
2018 0– 4 2 1 1 0 0.0 0.0 0.0
5– 9 0 0 0 0 0.0 0.0 0.0
10–14 20 9 11 0 0.1 0.1 0.1
15–19 1,618 1,175 442 1 7.7 10.9 4.3
20–24 6,140 5,061 1,076 3 27.8 44.6 10.0
25–29 7,712 6,625 1,077 10 33.0 55.7 9.4
30–34 5,907 5,084 816 7 26.9 45.8 7.5
35–39 4,200 3,574 621 5 19.8 33.7 5.8
40–44 2,690 2,328 358 4 13.7 23.9 3.6
45–54 4,398 3,973 423 2 10.4 19.0 2.0
55–64 1,929 1,782 145 2 4.6 8.8 0.7
65+ 437 412 25 0 0.9 1.8 0.1
Unknown Age 10 10 0 0      
Total 35,063 30,034 4,995 34 10.8 18.7 3.0

* No population data are available for unknown sex and age; therefore, rates are not calculated.

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Page last reviewed: August 20, 2019
Content source: Division of STD Prevention, National Center for HIV/AIDS, Viral Hepatitis, STD, and TB Prevention, Centers for Disease Control and Prevention