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Table 1 Summary of incidence of positive heartworm antigen test results and the relative change in incidence 2013 to 2016

From: Increasing incidence of Dirofilaria immitis in dogs in USA with focus on the southeast region 2013–2016

State/Region 2013 2016 Relative change in incidence 2016 vs 2013 (%)
No. of tests conducted No. of positive results Incidence (%) No. of tests conducted No. of positive results Incidence (%)
United States 6,980,504 77,557 1.11 9,266,427 118,689 1.28 15.28
Alabama 84,958 2481 2.92 114,531 4428 3.87 32.39
Arkansas 36,283 1259 3.47 55,482 2405 4.33 24.92
Florida 594,004 7979 1.34 712,653 9048 1.27 -5.48
Georgia 241,678 5348 2.21 317,229 7842 2.47 11.71
Louisiana 61,321 3782 6.17 103,667 7242 6.99 13.27
Mississippi 16,017 1340 8.37 38,579 2905 7.53 -9.99
Missouri 145,571 1437 0.99 168,206 2549 1.52 53.51
North Carolina 324,493 6555 2.02 441,015 9386 2.13 5.36
Oklahoma 44,351 831 1.87 60,327 1363 2.26 20.58
South Carolina 136,549 3099 2.27 176,438 4550 2.58 13.63
Tennessee 140,553 3423 2.44 173,571 5326 3.07 26.00
Texas 525,667 14,322 2.72 735,395 23,489 3.19 17.23
Southeastern USA 2,351,445 51,856 2.21 3,097,093 80,533 2.60 17.91
Rest of USA 4,629,059 25,701 0.56 6,169,334 38,156 0.62 11.40