2016 Case Counts in the US
2020 | 2019 | 2018 | 2017 | 2016 | 2015
Final data reported to ArboNET
In 2016, Zika virus disease became a nationally notifiable condition. Cases are reported to CDC by state, territorial, and local health departments using standard case definitions. These are final 2016 data reported to ArboNET for Zika virus disease.
US States
- 5,168 symptomatic Zika virus disease cases reported†
- 4,897 cases in travelers returning from affected areas
- 224 cases acquired through presumed local mosquito-borne transmission in Florida (N=218) and Texas (N=6)
- 47 cases acquired through other routes, including sexual transmission (N=45), laboratory transmission (N=1), and person-to-person through an unknown route (N=1)
US Territories
- 36,512 symptomatic Zika virus disease cases reported†
- 145 cases in travelers returning from affected areas
- 36,367 cases acquired through presumed local mosquito-borne transmission
- 0 cases acquired through other routes‡
Footnotes
†Excludes congenital disease cases.
‡Sexually transmitted cases are not reported for US territories because with local transmission of Zika virus it is not possible to determine whether infection occurred due to mosquito-borne or sexual transmission.
Cases by State and Territory
| Laboratory-confirmed symptomatic Zika virus disease cases and presumptive viremic blood donors reported to ArboNET by states and territories— United States, 2016 | ||||
|---|---|---|---|---|
| Symptomatic disease cases*(N=5,168) | Presumptive viremic blood donors†(N=38) | |||
| States | No. | (%) | No. | (%) |
| Alabama | 37 | (1) | 1 | (3) |
| Arizona | 54 | (1) | 1 | (3) |
| Arkansas | 13 | (<1) | 0 | (0) |
| California | 421 | (8) | 4 | (11) |
| Colorado | 55 | (1) | 0 | (0) |
| Connecticut | 118 | (2) | 0 | (0) |
| Delaware | 17 | (<1) | 0 | (0) |
| District of Columbia | 41 | (1) | 0 | (0) |
| Florida‡ | 1,107 | (21) | 23 | (61) |
| Georgia | 107 | (2) | 0 | (0) |
| Hawaii | 11 | (<1) | 0 | (0) |
| Idaho | 5 | (<1) | 0 | (0) |
| Illinois | 105 | (2) | 0 | (0) |
| Indiana | 49 | (1) | 0 | (0) |
| Iowa | 26 | (1) | 1 | (3) |
| Kansas | 20 | (<1) | 0 | (0) |
| Kentucky | 31 | (1) | 0 | (0) |
| Louisiana | 38 | (1) | 0 | (0) |
| Maine | 12 | (<1) | 0 | (0) |
| Maryland | 130 | (3) | 0 | (0) |
| Massachusetts | 119 | (2) | 1 | (3) |
| Michigan | 67 | (1) | 0 | (0) |
| Minnesota | 66 | (1) | 0 | (0) |
| Mississippi | 23 | (<1) | 0 | (0) |
| Missouri | 37 | (1) | 0 | (0) |
| Montana | 9 | (<1) | 0 | (0) |
| Nebraska | 13 | (<1) | 0 | (0) |
| Nevada | 22 | (<1) | 1 | (3) |
| New Hampshire | 11 | (<1) | 0 | (0) |
| New Jersey | 180 | (3) | 0 | (0) |
| New Mexico | 10 | (<1) | 0 | (0) |
| New York | 1,002 | (19) | 2 | (5) |
| North Carolina | 100 | (2) | 0 | (0) |
| North Dakota | 3 | (<1) | 0 | (0) |
| Ohio | 83 | (2) | 0 | (0) |
| Oklahoma | 29 | (1) | 0 | (0) |
| Oregon | 47 | (1) | 0 | (0) |
| Pennsylvania | 175 | (3) | 0 | (0) |
| Rhode Island | 55 | (1) | 0 | (0) |
| South Carolina | 61 | (1) | 0 | (0) |
| South Dakota | 3 | (<1) | 0 | (0) |
| Tennessee | 61 | (1) | 0 | (0) |
| Texas‡ | 312 | (6) | 4 | (11) |
| Utah | 21 | (<1) | 0 | (0) |
| Vermont | 11 | (<1) | 0 | (0) |
| Virginia | 108 | (2) | 0 | (0) |
| Washington | 69 | (1) | 0 | (0) |
| West Virginia | 11 | (<1) | 0 | (0) |
| Wisconsin | 60 | (1) | 0 | (0) |
| Wyoming | 3 | (<1) | 0 | (0) |
| Symptomatic disease cases* (N=36,512) | Presumptive viremic blood donors† (N=325) | |||
| Territories | No. | (%) | No. | (%) |
| American Samoa | 131 | (<1) | 0 | (0) |
| Puerto Rico | 35,395 | (97) | 325 | (100) |
| U.S. Virgin Islands | 986 | (3) | 0 | (0) |
Footnotes
*Includes reported confirmed and probable Zika virus disease cases per the CSTE case definitions.
† Presumptive viremic blood donors are people who reported no symptoms at the time of donating blood, but whose blood tested positive when screened for the presence of Zika virus RNA by the blood collection agency. Some presumptive viremic blood donors develop symptoms after their donation or may have had symptoms in the past. These individuals may be reported as both Zika virus disease cases and presumptive viremic blood donors.
‡Includes 218 cases in Florida and 6 cases in Texas that were acquired through presumed local mosquito-borne transmission.
