Table 32. Chlamydia — Reported Cases and Rates of Reported Cases by Age Group and Sex, United States

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The table below is from Sexually Transmitted Infections Surveillance, 2023.

2019-2023

Year Age Group Cases Rates per 100,000 Population*
Total Male Female Unknown Sex Total Male Female
2019 0-4 523 201 320 2 2.7 2.0 3.3
5-9 182 32 146 4 0.9 0.3 1.5
10-14 11,561 1,432 10,094 35 55.6 13.5 99.2
15-19 453,927 108,724 344,130 1,073 2,156.0 1,011.8 3,338.2
20-24 649,450 209,635 438,567 1,248 3,002.1 1,894.6 4,149.9
25-29 340,542 140,281 199,581 680 1,448.6 1,168.6 1,734.8
30-34 163,671 78,579 84,726 366 729.7 692.0 764.9
35-39 84,687 43,605 40,897 185 389.6 400.6 376.8
40-44 43,005 23,715 19,185 105 215.9 239.4 191.6
45-54 40,480 25,150 15,256 74 99.0 124.7 73.7
55-64 13,984 9,567 4,378 39 32.9 46.7 19.9
65+ 2,783 2,036 736 11 5.1 8.5 2.5
Unknown Age 3,908 1,380 2,454 74
TOTAL 1,808,703 644,337 1,160,470 3,896 551.0 398.6 696.6
2020 0-4 559 216 328 15 2.9 2.2 3.5
5-9 197 39 155 3 1.0 0.4 1.6
10-14 9,922 1,201 8,692 29 45.6 10.8 81.9
15-19 386,550 90,944 294,624 982 1,794.0 825.9 2,796.4
20-24 575,556 180,060 394,149 1,347 2,680.9 1,644.8 3,746.2
25-29 297,451 118,636 178,085 730 1,299.3 1,020.9 1,579.8
30-34 148,819 69,456 79,015 348 652.0 601.4 700.9
35-39 73,333 37,085 36,068 180 330.2 330.7 328.0
40-44 37,115 20,139 16,875 101 180.5 195.3 164.6
45-54 32,381 19,930 12,352 99 78.6 96.8 59.9
55-64 11,600 7,941 3,629 30 26.9 37.6 16.5
65+ 2,174 1,549 602 23 4.0 6.4 2.0
Unknown Age 4,228 1,480 2,487 261
TOTAL 1,579,885 548,676 1,027,061 4,148 476.7 334.2 614.1
2021 0-4 463 178 280 5 2.5 1.8 3.0
5-9 163 19 141 3 0.8 0.2 1.4
10-14 10,012 1,288 8,692 32 46.7 11.7 83.1
15-19 375,884 90,720 284,306 858 1,743.1 823.0 2,697.0
20-24 586,315 184,350 400,702 1,263 2,724.0 1,680.0 3,797.8
25-29 308,559 123,735 184,151 673 1,378.0 1,087.4 1,672.1
30-34 168,421 80,320 87,753 348 729.0 688.0 767.9
35-39 84,257 43,388 40,684 185 377.8 385.2 368.7
40-44 44,313 24,546 19,674 93 210.0 231.7 187.2
45-54 38,435 23,338 15,012 85 94.5 114.9 73.7
55-64 14,249 9,838 4,387 24 33.3 46.9 20.1
65+ 2,780 1,998 768 14 5.0 7.9 2.5
Unknown Age 10,565 3,755 6,696 114
TOTAL 1,644,416 587,473 1,053,246 3,697 495.5 357.4 628.8
2022 0-4 529 198 315 16 2.9 2.1 3.5
5-9 167 42 125 0 0.8 0.4 1.3
10-14 10,442 1,478 8,923 41 50.0 13.8 87.6
15-19 376,345 95,187 279,919 1,239 1,739.5 858.9 2,652.3
20-24 576,253 182,289 392,214 1,750 2,537.9 1,571.2 3,532.3
25-29 305,857 122,749 182,244 864 1,378.2 1,081.2 1,681.2
30-34 175,859 84,562 90,859 438 754.5 714.4 792.1
35-39 90,159 47,220 42,700 239 404.9 417.8 389.4
40-44 48,692 27,048 21,532 112 227.2 250.0 202.9
45-54 41,920 25,286 16,532 102 103.7 124.7 82.0
55-64 16,204 11,285 4,878 41 38.5 54.6 22.8
65+ 3,572 2,584 974 14 6.2 10.0 3.1
Unknown Age 3,717 1,277 2,358 82
TOTAL 1,649,716 601,205 1,043,573 4,938 495.0 363.7 621.2
2023 0-4 471 170 289 12 2.5 1.8 3.2
5-9 141 28 111 2 0.7 0.3 1.1
10-14 11,563 1,828 9,697 38 55.5 17.1 95.4
15-19 377,855 100,096 276,593 1,166 1,711.7 886.1 2,566.1
20-24 542,040 173,261 367,021 1,758 2,485.1 1,557.1 3,435.1
25-29 294,876 118,233 175,785 858 1,339.2 1,057.9 1,621.3
30-34 176,184 84,506 91,188 490 748.9 711.1 783.3
35-39 93,853 49,516 44,081 256 417.0 435.7 395.6
40-44 51,245 28,556 22,527 162 234.2 259.6 206.9
45-54 44,010 26,241 17,657 112 108.7 130.0 87.0
55-64 17,397 11,954 5,411 32 41.6 58.3 25.3
65+ 3,789 2,837 937 15 6.4 10.6 2.9
Unknown Age 35,144 13,219 21,739 186
TOTAL 1,648,568 610,445 1,033,036 5,087 492.2 368.3 610.7
* No population data are available for unknown sex and age; therefore, rates are not calculated.

NOTE: Cases in the 0–4 age group may include cases due to perinatal transmission. Cases and rates shown in this table include District of Columbia but exclude US territories. See Technical Notes for more information on chlamydia case reporting. This report includes data from years that coincide with the COVID-19 pandemic, which introduced uncertainty and difficulty in interpreting case data. See Impact of COVID-19 on STIs for more information.
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Content Source:
National Center for HIV, Viral Hepatitis, STD, and Tuberculosis Prevention; About Division of STD Prevention