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2016 Case Counts in the US

See Also

  • Cases in Pregnant Women

    CDC reports the number of pregnant women with any laboratory evidence of possible Zika virus infection in the United States and territories.

  • Pregnancy Outcomes

    CDC reports the outcomes of pregnancies with laboratory evidence of possible Zika virus infection in the United States.

  • Information for Blood and Tissue Collection Centers

    See information on areas of active Zika virus transmission risk for the purposes of blood and tissue safety intervention.

2017  |  2016  |  2015

Provisional Data* as of May 10, 2017
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. This web page contains provisional data reported to ArboNET for 2016.

US States

  • 5,102 symptomatic Zika virus disease cases reported†
    • 4,830 cases in travelers returning from affected areas
    • 224 cases acquired through presumed local mosquito-borne transmission in Florida (N=218) and Texas (N=6)
    • 48 cases acquired through other routes, including sexual transmission (N=46), laboratory transmission (N=1), and person-to-person through an unknown route (N=1)

US Territories

  • 36,079 symptomatic Zika virus disease cases reported†
    • 142 cases in travelers returning from affected areas
    • 35,937 cases acquired through presumed local mosquito-borne transmission
    • 0 cases acquired through other routes‡

Footnotes
*Data are provisional and might not reflect the actual number of Zika virus disease cases due to delays in reporting.

†Excludes congenital disease cases. Data reported to the US Zika Pregnancy Registry for outcomes of pregnancies with laboratory evidence of possible Zika virus infection in the United States is available on Outcomes of Pregnancies with Laboratory Evidence of Possible Zika Virus Infection in the United States.

‡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.

See Also

  • Cases in Pregnant Women

    CDC reports the number of pregnant women with any laboratory evidence of possible Zika virus infection in the United States and territories.

  • Pregnancy Outcomes

    CDC reports the outcomes of pregnancies with laboratory evidence of possible Zika virus infection in the United States.

  • Information for Blood and Tissue Collection Centers

    See information on areas of active Zika virus transmission risk for the purposes of blood and tissue safety intervention.

Cases by State and Territory

ARBONET Zika Travel Local Cases Map 2016

Laboratory-confirmed symptomatic Zika virus disease cases and presumptive viremic blood donors reported to ArboNET by states and territories— United States, 2016 (Provisional data as of May 10, 2017)
Symptomatic disease cases*

(N=5,102)

 Presumptive viremic blood donors†

(N=37)
States No. (%) No. (%)
Alabama 37 (1) 0 (0)
Arizona 54 (1) 1 (3)
Arkansas 13 (<1) 0 (0)
California 421 (8) 4 (11)
Colorado 55 (1) 0 (0)
Connecticut 58 (1) 0 (0)
Delaware 17 (<1) 0 (0)
District of Columbia 39 (1) 0 (0)
Florida‡ 1,115 (22) 23 (62)
Georgia 107 (2) 0 (0)
Hawaii 11 (<1) 0 (0)
Idaho 4 (<1) 0 (0)
Illinois 103 (2) 0 (0)
Indiana 49 (1) 0 (0)
Iowa 26 (1) 1 (3)
Kansas 20 (<1) 0 (0)
Kentucky 32 (1) 0 (0)
Louisiana 38 (1) 0 (0)
Maine 12 (<1) 0 (0)
Maryland 130 (3) 0 (0)
Massachusetts 118 (2) 1 (3)
Michigan 67 (1) 0 (0)
Minnesota 67 (1) 0 (0)
Mississippi 23 (<1) 0 (0)
Missouri 35 (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 (4) 0 (0)
New Mexico 10 (<1) 0 (0)
New York 1,001 (20) 2 (5)
North Carolina 97 (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 54 (1) 0 (0)
South Carolina 59 (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 2 (<1) 0 (0)
  Symptomatic disease cases*

                      (N=36,079)

 Presumptive viremic blood donors†                    

(N=322)
Territories No. (%) No. (%)
American Samoa 129 (<1) 0 (0)
Puerto Rico 34,963 (97) 322 (100)
U.S. Virgin Islands 987 (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.

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