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Volume 16, Number 4—April 2010

Dispatch

Influenza Virus Transmission from Horses to Dogs, Australia

Peter D. KirklandComments to Author , Deborah S. Finlaison, Ellie Crispe, and Aeron C. Hurt
Author affiliations: Elizabeth Macarthur Agricultural Institute, Menangle, New South Wales, Australia (P.D. Kirkland, D.S. Finlaison); Warwick Farm Equine Centre, Warwick Farm, New South Wales, Australia (E. Crispe); World Health Organization Collaborating Centre for Reference and Research on Influenza, North Melbourne, Victoria, Australia (A.C. Hurt)

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Table

Clinical signs and serologic findings for 40 dogs exposed to equine influenza virus, Australia, October 2007*

Dog Breed Age/sex Clinical signs Day of sample collection
PCR Titer
ELISA
HI assay
1st 2nd 1st 2nd 3rd† 1st 2nd 3rd†
1 Cattle dog x 6 mo/F Cough 5 NS Neg 70 NA NA 64 NA NA
2 Whippet 6 mo/F Cough, inappetance, lethargy, nasal discharge 5 25 Neg 79 69 Neg 128 128 128
3 Rottweiler UK Cough, lethargy 10 25 Neg Neg 65 Neg Neg Neg Neg
4 Dalmation 3 y/MN Cough, inappetance, lethargy 11 NS Neg 74 NA NA 64 NA NA
5 Kelpi x 9.5 y/FN Cough, lethargy 12 26 Neg 66 74 NA 64 128 NA
6 Border collie 5 y/MN Inappetance, lethargy 13 27 Neg 60 75 Neg 64 32 64
7 Cattle dog 4.5 y/M Cough, lethargy 13 27 Neg 64 57 Neg 256 128 128
8 German shepherd 9 y/M Inappetance, lethargy 14 30 Neg Neg Neg NA Neg Neg NA
9 Jack Russell 9 y/MN Cough 14 30 Neg Neg 65 NA Neg Neg NA
10 Lowchen 2 y/MN Cough, inappetance, lethargy, nasal discharge 26 NS Neg Neg NA Neg Neg NA Neg
11 Cattle dog x 18 mo/F None 10 26 Neg 77 75 NA 64 64 NA
12 Fox terrier x poodle 15 y/FN None; lived with dog 4 11 NS Neg Neg Neg NA Neg Neg NA
13 Kelpie x 4 y/MN None 12 26 Neg 64 71 Neg 128 64 128
14 German shepherd 1.5 y/MN None 12 26 Neg 71 67 Neg 128 64 64
15 Kelpie x labrador 10 y/FN None 12 26 Neg 71 80 Neg 256 32 Neg
16 Cattle x kelpie 3 y/MN None 12 27 Neg 64 61 Neg 128 32 64
17 Unknown UK None 12 27 Neg 66 66 Neg 256 64 32
18 Border collie 1 y/M None 12 27 Neg 78 59 Neg 128 64 128
19 Jack Russell x 2.5 y/MN None 12 26 Neg 49 71 NA 32 16 NA
20 Greyhound 18 mo/F None 12 26 Neg Neg Neg NA 256 128 NA
21 Greyhound 2 y. M None 12 26 Neg Neg 55 NA Neg Neg NA
22 Greyhound 5 y/M None 12 25 Neg Neg Neg NA Neg Neg NA
23 Greyhound 18 mo/F None 12 25 Neg Neg Neg NA Neg Neg NA
24 Greyhound 18 m/F None 12 25 Neg Neg Neg NA Neg Neg NA
25 Cattle x kelpie 4 y/FN None 12 26 Neg 51 73 Neg 128 64 64
26 Poodle 5 mo/M None, lived with dog 7 13 27 Neg Neg Neg Neg 8 Neg Neg
27 Jack Russell 5 y/F None, lived with dog 5 13 27 Neg Neg Neg NA Neg Neg NA
28 Cattle x hunterway 4.5 y/M None 14 30 Pos Neg 50 NA Neg 64 NA
29 Border collie 4 y/FN None 15 NS Neg Neg NA NA Neg NA NA
30 Cattle 13 y/MN None 15 NS Neg Neg NA NA >32 NA NA
31 Jack Russell UK None 15 NS Neg 76 NA NA 64 NA NA
32 Rottweiler UK None 15 NS Neg 76 NA Inc 128 NA 128
33 Fox terrier 4 y/MN None 15 NS Neg 78 NA NA 32 NA NA
34 Labrador 13 y/FN None 15 NS Neg 51 NA NA 64 NA NA
35 x UK None 18 NS Neg Neg NA Neg Neg NA Neg
36 x UK None 18 NS Neg 73 NA Neg 64 NA 64
37 x UK None 18 NS Neg Neg NA Neg Neg NA Neg
38 x UK None 18 NS Neg Neg NA NA Neg NA NA
39 x UK None 18 NS Neg 67 NA Neg 256 NA 128
40 Poodle x 9 y/UK None, lived with dog 10 26 NS Neg Neg NA Neg Neg NA Neg

*HI, hemagglutination inhibition; x, cross-breed; NS, not sampled; neg, negative; NA, not applicable; pos, positive; UK, unknown; MN, male neutered; FN, female neutered.
†Samples collected ≈2 y after second sample.

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