West Nile Virus Disease Cases by State 2021

West Nile Virus Disease Cases* and Presumptive Viremic Blood Donors by State – United States, 2021 (as of September 21, 2021)

West Nile Virus Disease Cases and Presumptive Viremic Blood Donors by State – United States, 2020
State Neuroinvasive
Disease Cases†
Non–neuroinvasive
Disease Cases
Total
cases
Deaths Presumptive viremic
blood donors‡
Alabama 5 3 8 0 3
Arizona 77 20 97 4 35
Arkansas 1 0 1 1 0
California 31 17 48 4 11
Colorado 40 43 83 2 9
Connecticut 3 0 3 0 0
District of Columbia 1 1 2 1 0
Georgia 1 0 1 0 0
Idaho 3 0 3 1 1
Illinois 11 7 18 0 3
Iowa 2 2 4 0 0
Kansas 1 1 2 0 1
Louisiana 10 1 11 0 1
Maryland 0 2 2 0 0
Massachusetts 6 0 6 0 0
Michigan 15 5 20 0 3
Minnesota 0 1 1 0 12
Missouri 2 0 2 0 0
Nebraska 24 14 38 2 10
New Jersey 1 2 3 1 0
New Mexico 6 3 9 0 2
New York 12 2 14 0 1
North Dakota 8 14 22 1 8
Ohio 4 1 5 0 0
Oklahoma 2 1 3 0 2
Oregon 1 0 1 0 0
Pennsylvania 3 2 5 0 0
South Carolina 2 2 4 0 5
South Dakota 13 13 26 1 2
Tennessee 2 1 3 0 0
Texas 12 2 14 2 24
Utah 14 4 18 1 0
Virginia 1 0 1 0 0
Washington 1 0 1 0 2
Totals 315 164 479 21 135

*Includes confirmed and probable cases.

†Includes cases reported as meningitis, encephalitis, or acute flaccid paralysis.

‡Presumptive viremic blood donors (PVDs) are people who had no symptoms at the time of donating blood through a blood collection agency, but whose blood tested positive when screened for the presence of West Nile virus. Some PVDs develop symptoms after donation.

Please refer to state health department web sites for further details regarding state case totals.