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Table 5 Colorado canine heartworm prevalence by year in counties with documented dog importation from out of state [positive tests/total tests (%)]

From: Dog importation and changes in heartworm prevalence in Colorado 2013–2017

  2013 2014 2015 2016 2017
Colorado (total) 610/122,585 (0.5) 641/129,433 (0.5) 1007/142,600 (0.71) 1208/155,636 (0.78) 1438/171,208 (0.84)
Adamsa 15/4764 (0.31) 20/4742 (0.42) 35/7454 (0.47) 40/9264 (0.43) 60/8796 (0.68)
Arapahoea 45/16,582 (0.27) 56/17,097 (0.33) 69/18,318 (0.38) 128/20,032 (0.64) 145/22,988 (0.63)
Archuleta 0/16 (0) 0/17 (0) 3/28 (10.71) 0/18 (0) 2/21 (9.52)
Bouldera 78/10,330 (0.76) 60/11,428 (0.53) 129/12,385 (1.04) 143/14,332 (1.0) 174/16,155 (1.08)
Broomfielda 6/703 (0.85) 8/1515 (0.53) 12/1568 (0.77) 15/2451 (0.61) 30/3612 (0.83)
Chaffee 0/1443 (0) 1/70 (1.43) 1/2 (50) 0/7 (0) 0/6 (0)
Clear Creeka na na 0/1 (0) 0/2 (0) 0/2 (0)
Costilla na 0/12 (0) 0/4 (0) na 0/2 (0)
Deltaa 3/201 (1.49) 1/179 (0.56) 5/171 (2.92) 1/188 (0.53) 0/286 (0)
Denvera 95/22,042 (0.43) 81/24,739 (0.33) 154/26,046 (0.59) 237/26,737 (0.89) 236/29,669 (0.8)
Douglasa 31/11,037 (0.28) 45/11,514 (0.39) 23/12,386 (0.19) 47/14,123 (0.33) 70/15,065 (0.46)
Eaglea 1/221 (0.45) 0/215 (0) 9/279 (3.23) 5/326 (1.53) 5/234 (2.14)
El Pasoa 92/13,849 (0.66) 87/14,592 (0.6) 102/16,121 (0.63) 114/16,661 (0.68) 180/17,598 (1.01)
Elberta 2/562 (0.36) 4/673 (0.59) 4/716 (0.56) 2/776 (0.26) 7/946 (0.74)
Fremonta 12/1254 (0.96) 19/1745 (1.09) 16/1164 (1.37) 12/920 (1.3) 8/832 (0.96)
Garfielda 5/627 (0.8) 3/493 (0.61) 6/702 (0.85) 16/833 (1.92) 8/733 (1.09)
Granda 1/11 (9.09) 0/7 (0) 3/13 (23.08) 3/16 (18.75) 1/10 (10)
Gunnisona 1/48 (2.08) 1/36 (2.78) 2/16 (12.5) 1/78 (1.28) 2/54 (3.7)
Huerfanoa na na na 0/6
(0)
0/51
(0)
Jeffersona 115/20,559 (0.56) 142/21,818 (0.65) 272/24,446 (1.11) 242/25,564 (0.95) 248/26,073 (0.95)
Kit Carson na na na na na
La Plataa 10/912 (1.1) 5/858 (0.58) 8/1059 (0.76) 8/942 (0.85) 5/866 (0.58)
Larimera 19/7282 (0.26) 18/7685 (0.23) 37/8061 (0.46) 45/8564 (0.53) 64/10,589 (0.6)
Las Animasa na na na na 0/1 (0)
Mesaa 15/1085 (1.38) 15/1138 (1.32) 8/1483 (0.54) 25/2357 (1.06) 44/2978 (1.48)
Montezuma 1/186 (0.54) 5/205 (2.44) 4/215 (1.86) 5/297 (1.68) 6/404 (1.49)
Morgan na na 0/1 (0) na na
Ouray na na na 1/159 (0.63) 3/158 (1.9)
Parka 0/281 (0) 2/428 (0.47) 4/532 (0.75) 6/537 (1.12) 5/590 (0.85)
Pitkina 0/23 (0) 0/11 (0) 1/35 (2.86) 7/232 (3.02) 16/774 (2.07)
Puebloa 17/900 (1.89) 9/838 (1.07) 25/1388 (1.80) 30/1446 (2.07) 40/2358 (1.7)
Rio Blancoa na na na 0/1 (0.0) 0/2 (0)
Routt 2/91 (2.2) 4/110 (3.64) 4/149 (2.68) 3/254 (1.18) 8/350 (2.29)
Summita 12/1634 (0.73) 19/1878 (1.01) 18/2241 (0.80) 18/1963 (0.92) 16/1521 (1.05)
Tellera 1/296 (0.34) 1/279 (0.36) 3/499 (0.60) 6/881 (0.68) 11/1340 (0.82)
Welda 20/4109 (0.49) 33/3751 (0.88) 44/4325 (1.02) 43/5156 (0.83) 37/5748 (0.64)
  1. aMore than 100 dogs imported from out-of-state 2013–2017
  2. Abbreviation: na, not available