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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 web page contains provisional data reported to ArboNET for January 1, 2015 – February 15, 2017.  

US States

  • 5,040 Zika virus disease cases reported
    • 4,748 cases in travelers returning from affected areas
    • 220 cases acquired through presumed local mosquito-borne transmission in Florida (N=214) and Texas (N=6)
    • 72 cases acquired through other routes, including sexual transmission (N=44), congenital infection (N=26), laboratory transmission (N=1), and person-to-person through an unknown route (N=1)

US Territories

  • 37,023 Zika virus disease cases reported
  • 141 cases in travelers returning from affected areas
  • 36,882 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 viremic blood donors reported to ArboNET by states and territories — United States, 2015–2017 (as of February 15, 2017)
States Symptomatic disease cases**
(N=5,040)
No.  (%)
Viremic blood donors†
(N=36)
No.  (%)
Alabama 38    (1) 0    (0)
Arizona 55    (1) 1    (3)
Arkansas    15    (<1) 0    (0)
California 420    (9) 5    (14)
Colorado  54    (1) 0    (0)
Connecticut  58    (1) 0    (0)
Delaware    17    (<1) 0    (0)
District of Columbia  31    (1) 0    (0)
Florida‡ 1,069   (21) 24    (67)
Georgia 108    (2) 0    (0)
Hawaii    16    (<1) 0    (0)
Idaho     4    (<1) 0    (0)
Illinois 94    (2) 0    (0)
Indiana 53    (1) 0    (0)
Iowa   21   (<1) 0    (0)
Kansas  21   (<1) 0    (0)
Kentucky 32    (1) 0    (0)
Louisiana 39    (1) 0    (0)
Maine  14    (<1) 0    (0)
Maryland 130  (3) 0    (0)
Massachusetts 120  (2) 0    (0)
Michigan 66    (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) 1    (3)
New Hampshire  12    (<1) 0    (0)
New Jersey  176    (4) 0    (0)
New Mexico     10    (<1) 0    (0)
New York 1,020  (21) 2    (6)
North Carolina 91    (2) 0    (0)
North Dakota     2    (<1) 0    (0)
Ohio 84    (2) 0    (0)
Oklahoma 29    (1) 0    (0)
Oregon 46    (1) 0    (0)
Pennsylvania 173  (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‡ 306   (6)  3    (8)
Utah   22   (<1) 0    (0)
Vermont  11    (<1) 0    (0)
Virginia 112   (2) 0    (0)
Washington  70   (1) 0    (0)
West Virginia  11    (<1) 0    (0)
Wisconsin 48    (1) 0    (0)
Wyoming    2    (<1) 0    (0)
     
Territories Symptomatic disease cases**
(N=37,023)
No.  (%)
Viremic blood donors†
(N=318)
No.  (%)
American Samoa   120  (<1)  0    (0)
Puerto Rico 35,930  (97)  318   (100)
US Virgin Islands   973   (3)  0    (0)

** Includes reported confirmed and probable Zika virus disease cases per the CSTE case definitions.

† 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 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 viremic blood donors.
‡Includes 210 cases in Florida and 6 cases in Texas that were acquired through presumed local mosquito-borne transmission.

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