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Volume 23, Number 12—December 2017

Synopsis

Spread of Canine Influenza A(H3N2) Virus, United States

Ian E.H. Voorhees, Amy L. Glaser, Kathy Toohey-Kurth, Sandra Newbury, Benjamin D. Dalziel, Edward Dubovi, Keith Poulsen, Christian Leutenegger, Katriina J.E. Willgert, Laura Brisbane-Cohen, Jill Richardson-Lopez, Edward C. Holmes, and Colin R. ParrishComments to Author 
Author affiliations: Cornell University, Ithaca, New York, USA (I.E.H. Voorhees, A.L. Glaser, E.J. Dubovi, K.J.E. Willgert, L. Brisbane-Cohen, C.R. Parrish); University of Wisconsin, Madison, Wisconsin, USA (K. Toohey-Kurth, S. Newbury, K. Poulsen); Oregon State University, Corvallis, Oregon, USA (B.D. Dalziel); IDEXX Laboratories, West Sacramento, California, USA (C. Leutenegger); Royal Veterinary College, London, UK (K.J.E. Willgert); Merck Animal Health, Madison, New Jersey, USA (J. Richardson-Lopez); University of Sydney, Sydney, New South Wales, Australia (E.C. Holmes)

Main Article

Table 1

Persistence of virus or viral RNA in dogs in 2 separate Chicago-area animal shelters that were infected with canine influenza A(H3N2) virus, United States, April 2015*

1
2
3
4
5
16
Shelter 2
1 Neg 37.4 25.1 37.9 26 29.5†
5 NT NT 22.7 24.6† NT NT
6 24.6† 23.7† NT NT NT NT
10 36.2 39.5 NT NT NT NT
11 NT NT NT NT 37.1 NT
15 NT NT 38.6† 35.9 38.2† 36
19 NT NT Neg NT NT NT
20 37.3 37.2 NT NT NT NT
23 NT NT Neg NT NT Neg
24 Neg Neg NT NT NT NT
28 Neg Neg NT NT NT NT

*Data from Newbury et al. (33) Table 1, used with permission. Data shown as rRT-PCR Ct values. Values <36 are considered positive results (black cells), and values >37 but <40 are considered weak positive results (dark gray cells). Light gray cells indicate negative rRT-PCR assay results for influenza A virus shedding. Ct, cycle threshold; Neg, negative; NT, not tested; rRT-PCR, real-time reverse transcription PCR.
†Samples for which virus was successfully isolated.

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