2018 Equine Infectious Anemia Cases 

in the United States

January 1– December 31, 2018

This document summarizes State reporting of equine infectious anemia (EIA) cases in the United States 

during 2018. State animal health officials report EIA testing and case information to APHIS Veterinary 

Services (VS) through the National Animal Health Reporting System (NAHRS). The NAHRS is an online 

reporting tool enabling States to submit animal disease information to VS through the Internet with 

assurance of secure data transfer and information confidentiality. APHIS-VS requested EIA information 

by e-mail from States that did not use NAHRS and recorded the data in the NAHRS database.

Reporting of EIA testing is summarized on a calendar-year basis. During 2018, a total of 1,187,536 EIA 

tests were conducted, resulting in detection of 51 positive horses (Table 1.) These results compared to 

1,299,683 tests and 80 positives in 2017. Figure 1 displays a map depicting reported numbers of horses 

and premises testing positive for EIA in 2018. Figure 2 presents a summary of EIA testing from 2000-

2018. Historical data and additional information on EIA are available online at

http://www.aphis.usda.gov/animal-health/equine-health .

Table 1. Test results reported for equine infectious anemia in the United States, 2018

State Tests Performed Positive Horses Positive Premises

Alaska 0

1 0 0

Alabama 6,490 1 1

Arkansas 39,453 2 2

Arizona 5,085 0 0

California 23,924 0 0

Colorado 24,253 4 4

Connecticut Not Reporting Not Reporting Not Reporting

Delaware 3,931 0 0

Florida 106,833 1 1

Georgia 39,262 8 2

Hawaii 307 0 0

Iowa 16,600 2 1

Idaho 11,118 0 0

Illinois 22,022 2 2

Indiana 25,122 1 1

Kansas 13,417 0 0

Kentucky 63,621 0 0

 

1 All samples are sent to out-of-State laboratories and Alaska does not receive notification of the number of tests performed at 

these laboratories. 

Animal and Plant 

Health Inspection 

Service

Veterinary 

Services

March 2019
2018 Summary of Equine Infectious Anemia Cases in the United States

USDA-APHIS-VS 2

State Tests Performed Positive Horses Positive Premises

Louisiana 31,498 1 1

Massachusetts 12,537 1 1

Maryland 28,027 1 1

Maine 2,055 0 0

Michigan 31,107 0 0

Minnesota 20,863 0 0

Missouri 64,350 1 1

Mississippi 22,439 0 0

Montana 15,360 0 0

North Carolina 26,615 0 0

North Dakota 6,092 0 0

Nebraska 7,682 0 0

New Hampshire 13,224 0 0

New Jersey 10,820 0 0

New Mexico 9,403 0 0

Nevada 11,015 0 0

New York 41,854 0 0

Ohio 21,545 0 0

Oklahoma 55,891 0 0

Oregon 7,679 1 1

Pennsylvania 33,041 0 0

Puerto Rico 181 0 0

Rhode Island 1,659 0 0

South Carolina 31,216 0 0

South Dakota 8,693 0 0

Tennessee 32,029 1 1

Texas 122,282 24 13

U.S. Virgin Islands 83 0 0

Utah 11,602 0 0

Virginia 36,661 0 0

Vermont 4,644 0 0

Washington 5,023 0 0

Wisconsin 37,044 0 0

West Virginia 7,720 0 0

Wyoming 14,164 0 0

U.S. Totals 1,187,536 51 33
2018 Summary of Equine Infectious Anemia Cases in the United States

USDA-APHIS-VS 3

Figure 1. Reported numbers of horses and premises testing positive for EIA, 2018
2018 Summary of Equine Infectious Anemia Cases in the United States

USDA-APHIS-VS 4

Figure 2. Reported numbers of EIA tests and positive cases in the United States, 2000-2018

0

500

1000

1500

2000

2500

2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

Number of Tests x 1000 Number of Test-positive Horses