Table 2 Number and percentage positive for antigens of Dirofilaria immitis ^a in canine blood samples according to the relative prevalence in areas sampled

Hair coat length


Short

35/430

8.1

217/555

39.1^†


Medium

9/185

4.9

77/252

30.6*


Long

4/56

7.1

12/53

22.6*


White

19/226

8.4*^†

35/159

22.0*


Black

13/205

6.3^†

116/305

38.0^†


Golden

9/150

6.0^†

109/260

41.9^†


Brown

3/75

4.0^†

37/103

35.9^†


Gray

4/15

26.7*

9/33

27.3^†*

Life style


Outdoors

38/583

6.5

200/509

39.3*


Indoors

10/88

11.4

106/351

30.2^†

Age (yr)


1-2

23/330

7.0

57/204

27.9*


>2-4

8/111

7.2

95/268

35.5^†


>4-6

9/126

7.1

71/174

40.8^†


>6

8/104

7.7

83/214

38.89^†


1-2

15/205

7.3

78/245

31.8


>2-5

23/266

8.6

135/364

37.1


>5

10/200

5.0

93/250

37.2

Travel^b


No

45/650

6.9

296/813

36.4


Yes

3/20

15.0

10/47

21.3

Weight (kg)


<5

9/185

4.9^†

33/126

26.2^†


5-15 kg

33/266

12.4*

145/457

31.7^†


>15-25 kg

2/116

1.7^†

83/194

42.8*


>25 kg

4/104

3.9^†

45/83

54.2*

Hemoparasites^c


Never

44/638

6.9

245/704

34.8


Yes (previously)

1/18

5.6

33/70

47.1


No

47/636

7.4

243/706

34.4


Yes

1/32

3.1

31/79

39.2