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Volume 32, Number 2—February 2026

Research Letter

Multicenter Serologic Investigation of Influenza D Virus in Cats and Dogs, Europe, 2015–2024

Claudia Maria TrombettaComments to Author , Aurora Fiori1, Alessandro Falsini1, Francesco Pellegrini, Sophie Le Poder, Amit Eichenbaum, Venetia Cardona, Justine Oliva, Gilles Meyer, Nataliia Muzyka, Denys Muzyka, Emanuele Montomoli, Barbara di Martino, Mariette F. Ducatez, Gianvito Lanave, Vito Martella, and Michele Camero
Author affiliation: University of Siena, Siena, Italy (C.M. Trombetta, A. Fiori, A. Falsini, E. Montomoli); University of Bari Aldo Moro, Valenzano, Italy (F. Pellegrini, G. Lanave, V. Martella, M. Camero); Ecole Nationale Vétérinaire d’Alfort, Maisons-Alfort, France (S. Le Poder, A. Eichenbaum, V. Cardona); Université de Toulouse, Toulouse, France (J. Oliva, G. Meyer, M.F. Ducatez); National Scientific Center Institute of Experimental and Clinical Veterinary Medicine, Kharkiv, Ukraine (N. Muzyka; D. Muzyka); Linnaeus University, Kalmar, Sweden (D. Muzyka); VisMederi srl, Siena (E. Montomoli); University of Teramo, Teramo, Italy (B. di Martino); University of Veterinary Medicine, Budapest, Hungary (V. Martella)

Main Article

Table 2

HI titers of samples collected in 2024 in Ukraine, as part of multicenter serologic investigation of influenza D virus in cats and dogs, Europe, 2015–2024*

Sample no. HI assay titers
D/660 lineage D/OK lineage
Dog 20–20 <10
180 20–20 <10
182 20–20 <10
184
 10–10
 <10
Cat
181 20–20 <10

*Titers below the detectable threshold of 10 were expressed as <10 and considered negative. HI, hemagglutination inhibition.

Main Article

1These authors contributed equally to this article.

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