Table 19. Unknown Duration or Late Syphilis* — Reported Cases and Rates of Reported Cases by State/Territory and Region in Alphabetical Order, United States, 2016-2020

Table 19. Unknown Duration or Late Syphilis* — Reported Cases and Rates of Reported Cases by State/Territory and Region in Alphabetical Order, United States, 2016-2020
State/Territory
Cases
Rates per 100,000 Population
2016 2017 2018 2019 2020 2016 2017 2018 2019 2020
Alabama 232 347 354 461 489 4.8 7.1 7.2 9.4 10.0
Alaska 3 6 16 35 47 0.4 0.8 2.2 4.8 6.4
Arizona 680 829 1,243 1,444 1,637 9.8 11.8 17.3 19.8 22.5
Arkansas 131 156 287 414 484 4.4 5.2 9.5 13.7 16.0
California 6,216 7,787 9,609 11,817 10,572 15.8 19.7 24.3 29.9 26.8
Colorado 211 240 378 485 604 3.8 4.3 6.6 8.4 10.5
Connecticut 23 28 94 110 47 0.6 0.8 2.6 3.1 1.3
Delaware 34 88 63 55 53 3.6 9.1 6.5 5.6 5.4
District of Columbia 51 230 148 362 369 7.5 33.1 21.1 51.3 52.3
Florida 3,233 3,435 3,773 4,645 4,319 15.7 16.4 17.7 21.6 20.1
Georgia 1,478 1,580 1,773 2,144 2,038 14.3 15.1 16.9 20.2 19.2
Hawaii 13 10 27 34 113 0.9 0.7 1.9 2.4 8.0
Idaho 44 46 54 61 80 2.6 2.7 3.1 3.4 4.5
Illinois 1,623 1,399 1,570 1,760 1,845 12.7 10.9 12.3 13.9 14.6
Indiana 197 211 258 318 343 3.0 3.2 3.9 4.7 5.1
Iowa 127 96 112 126 143 4.1 3.1 3.5 4.0 4.5
Kansas 0 3 44 84 147 0.0 0.1 1.5 2.9 5.0
Kentucky 159 218 212 254 333 3.6 4.9 4.7 5.7 7.5
Louisiana 1,233 1,495 1,456 1,400 1,116 26.3 31.9 31.2 30.1 24.0
Maine 16 31 30 28 15 1.2 2.3 2.2 2.1 1.1
Maryland 719 783 913 888 888 12.0 12.9 15.1 14.7 14.7
Massachusetts 416 387 133 600 485 6.1 5.6 1.9 8.7 7.0
Michigan 424 447 622 652 677 4.3 4.5 6.2 6.5 6.8
Minnesota 289 327 330 354 306 5.2 5.9 5.9 6.3 5.4
Mississippi 107 71 50 91 78 3.6 2.4 1.7 3.1 2.6
Missouri 271 397 544 706 916 4.4 6.5 8.9 11.5 14.9
Montana 4 13 34 47 33 0.4 1.2 3.2 4.4 3.1
Nebraska 34 48 63 109 113 1.8 2.5 3.3 5.6 5.8
Nevada 347 575 775 985 909 11.8 19.2 25.5 32.0 29.5
New Hampshire 27 29 31 37 37 2.0 2.2 2.3 2.7 2.7
New Jersey 381 489 406 612 807 4.3 5.4 4.6 6.9 9.1
New Mexico 160 196 337 552 744 7.7 9.4 16.1 26.3 35.5
New York 3,484 3,592 3,404 3,232 2,791 17.6 18.1 17.4 16.6 14.3
North Carolina 756 1,015 1,075 1,231 1,256 7.5 9.9 10.4 11.7 12.0
North Dakota 16 22 30 42 44 2.1 2.9 3.9 5.5 5.8
Ohio 483 596 667 718 785 4.2 5.1 5.7 6.1 6.7
Oklahoma 90 95 253 577 515 2.3 2.4 6.4 14.6 13.0
Oregon 227 283 299 416 369 5.5 6.8 7.1 9.9 8.7
Pennsylvania 295 335 416 622 671 2.3 2.6 3.2 4.9 5.2
Rhode Island 81 79 117 213 128 7.7 7.5 11.1 20.1 12.1
South Carolina 36 40 27 92 214 0.7 0.8 0.5 1.8 4.2
South Dakota 15 20 23 28 20 1.7 2.3 2.6 3.2 2.3
Tennessee 713 543 688 898 979 10.7 8.1 10.2 13.1 14.3
Texas 4,666 6,035 5,819 5,707 6,678 16.7 21.3 20.3 19.7 23.0
Utah 106 97 152 169 138 3.5 3.1 4.8 5.3 4.3
Vermont 0 0 0 2 9 0.0 0.0 0.0 0.3 1.4
Virginia 235 551 659 722 591 2.8 6.5 7.7 8.5 6.9
Washington 400 480 504 632 616 5.5 6.5 6.7 8.3 8.1
West Virginia 45 25 64 109 160 2.5 1.4 3.5 6.1 8.9
Wisconsin 140 176 193 195 232 2.4 3.0 3.3 3.3 4.0
Wyoming 5 11 8 21 14 0.9 1.9 1.4 3.6 2.4
US TOTAL 30,676 35,992 40,137 47,296 46,997 9.5 11.1 12.3 14.4 14.3
Northeast 4,723 4,970 4,631 5,456 4,990 8.4 8.8 8.3 9.7 8.9
Midwest 3,619 3,742 4,456 5,092 5,571 5.3 5.5 6.5 7.5 8.2
South 13,918 16,707 17,614 20,050 20,560 11.4 13.5 14.1 16.0 16.4
West 8,416 10,573 13,436 16,698 15,876 11.0 13.7 17.2 21.3 20.3
American Samoa NR NR 0 0 0 0.0 0.0 0.0
Guam 10 5 9 21 16 6.0 3.0 5.4 12.5 9.5
Northern Mariana Islands NR NR 1 1 0 1.9 1.9 0.0
Puerto Rico 117 110 138 155 216 3.4 3.3 4.2 4.9 6.8
Virgin Islands 0 0 NR NR 27 0.0 0.0 25.3
TERRITORIES 127 115 148 177 259 3.4 3.2 4.2 5.1 7.3
TOTAL 30,803 36,107 40,285 47,473 47,256 9.4 11.0 12.2 14.3 14.2
* The case classification of ‘Unknown duration or late syphilis’ went into effect in January 2018. During 2016–2017, cases in this category include cases classified as late latent syphilis and late syphilis with clinical manifestations. See Technical Notes for a detailed explanation of changes to the syphilis case definition.

NR = No report.

NOTE: See Technical Notes for more information on interpreting case counts and rates in US territories. The COVID-19 pandemic has introduced uncertainty and difficulty in interpreting 2020 case data. See Impact of COVID-19 on STDs for more information.

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