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Case Counts in the US

Zika virus disease is now a nationally notifiable condition. Cases are reported to CDC by state, territorial, and local health departments using standard case definitions. This webpage contains provisional data reported to ArboNET for January 1, 2015 – March 22, 2017.  

US States

  • 5,158 Zika virus disease cases reported
    • 4,861 cases in travelers returning from affected areas
    • 222 cases acquired through presumed local mosquito-borne transmission in Florida (N=216) and Texas (N=6)
    • 75 cases acquired through other routes, including sexual transmission (N=45), congenital infection (N=28), laboratory transmission (N=1), and person-to-person through an unknown route (N=1)

US Territories

  • 38,212 Zika virus disease cases reported
    • 147 cases in travelers returning from affected areas
    • 38,065 cases acquired through presumed local mosquito-borne transmission
    • 0 cases acquired through other routes*

*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.

Laboratory-confirmed symptomatic Zika virus disease cases and presumptive viremic blood donors reported to ArboNET by states and territories — United States, 2015–2017 (as of March 22, 2017)
States Symptomatic disease cases**
(N=5,158)
No.  (%)
Presumptive viremic blood donors†
(N=43)
No.  (%)
Alabama 40    (1) 0    (0)
Arizona 54    (1) 1    (2)
Arkansas    15    (<1) 0    (0)
California 434    (9) 5    (12)
Colorado  57    (1) 0    (0)
Connecticut  58    (1) 0    (0)
Delaware    17    (<1) 0    (0)
District of Columbia  34    (1) 0    (0)
Florida‡ 1,109   (22) 26    (60)
Georgia 110    (2) 0    (0)
Hawaii    16    (<1) 0    (0)
Idaho     5    (<1) 0    (0)
Illinois 94    (2) 0    (0)
Indiana 53    (1) 0    (0)
Iowa   27   (1) 1    (2)
Kansas  22   (<1) 0    (0)
Kentucky 33    (1) 0    (0)
Louisiana 39    (1) 0    (0)
Maine  14    (<1) 0    (0)
Maryland 134  (3) 0    (0)
Massachusetts 125  (3) 1    (2)
Michigan 69    (1) 0    (0)
Minnesota 64    (1) 0    (0)
Mississippi 25    (1) 0    (0)
Missouri 36    (1) 0    (0)
Montana    9    (<1) 0    (0)
Nebraska  13    (<1) 0    (0)
Nevada  22    (<1) 2    (5)
New Hampshire  12    (<1) 0    (0)
New Jersey  182    (4) 0    (0)
New Mexico     10    (<1) 0    (0)
New York  1,012   (20) 3    (7)
North Carolina 100    (2) 0    (0)
North Dakota     3    (<1) 0    (0)
Ohio 85    (2) 0    (0)
Oklahoma 29    (1) 0    (0)
Oregon 48    (1) 0    (0)
Pennsylvania 178  (4) 0    (0)
Rhode Island 54    (1) 0    (0)
South Carolina 54    (1) 0    (0)
South Dakota   2    (<1) 0    (0)
Tennessee 61    (1) 0    (0)
Texas‡ 317   (6)  3    (7)
Utah   22   (<1) 0    (0)
Vermont  11    (<1) 0    (0)
Virginia 114   (2) 0    (0)
Washington  71   (1) 0    (0)
West Virginia  11    (<1) 1    (2)
Wisconsin 52    (1) 0    (0)
Wyoming    2    (<1) 0    (0)
     
Territories Symptomatic disease cases**
(N=38,212)
No.  (%)
Presumptive viremic blood donors†
(N=325)
No.  (%)
American Samoa   132  (<1)  0    (0)
Puerto Rico 37,083  (97)  325   (100)
US Virgin Islands   997   (3)  0    (0)

** 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 216 cases in Florida and 6 cases in Texas that were acquired through presumed local mosquito-borne transmission.

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