Asymptomatic infection with clade 2.3.4.4b highly pathogenic avian influenza A(H5N1) in carnivore pets, Italy, April 2023

Author:

Moreno Ana1ORCID,Bonfante Francesco2,Bortolami Alessio2,Cassaniti Irene34,Caruana Anna5,Cottini Vincenzo6,Cereda Danilo7,Farioli Marco7,Fusaro Alice2,Lavazza Antonio1,Lecchini Pierdavide8,Lelli Davide1,Maroni Ponti Andrea8,Nassuato Claudia6,Pastori Ambra2,Rovida Francesca34,Ruocco Luigi8,Sordilli Marco8,Baldanti Fausto934,Terregino Calogero92

Affiliation:

1. Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna (IZSLER), Brescia, Italy

2. Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Legnaro (Padua), Italy

3. SC Microbiology and Virology, IRCCS Policlinico San Matteo, Pavia, Italy

4. Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, Pavia, Italy

5. Dipartimento di Igiene e Prevenzione Sanitaria-ATS Brescia, Brescia, Italy

6. Dipartimento Veterinario e Sicurezza degli Alimenti di origine animale-ATS Brescia Direzione Generale, Brescia, Italy

7. General Directorate of Welfare, Regione Lombardia, Milan, Italy

8. Sanità Animale e Farmaci Veterinari, Ministero della Salute, Rome, Italy

9. These authors contributed equally to this work and share last authorship.

Abstract

In April 2023, an outbreak of clade 2.3.4.4b highly pathogenic avian influenza A(H5N1) viruses carrying the T271A mammalian adaptive mutation in the PB2 protein was detected in a backyard poultry farm in Italy. Five domestic dogs and one cat living on the premises had seroconverted in the absence of clinical signs. Virological and serological monitoring of individuals exposed to the virus proved the absence of human transmission, however, asymptomatic influenza A(H5N1) infections in mammalian pets may have important public health implications.

Publisher

European Centre for Disease Control and Prevention (ECDC)

Subject

Virology,Public Health, Environmental and Occupational Health,Epidemiology

Reference23 articles.

1. World Health Organization (WHO). Ongoing avian influenza outbreaks in animals pose risk to humans. Situation analysis and advice to countries from FAO, WHO, WOAH. Geneva: WHO; 2023. Available from: https://www.who.int/news/item/12-07-2023-ongoing-avian-influenza-outbreaks-in-animals-pose-risk-to-humans

2. PB2 residue 271 plays a key role in enhanced polymerase activity of influenza A viruses in mammalian host cells.;Bussey;J Virol,2010

3. Rank orders of mammalian pathogenicity-related PB2 mutations of avian influenza A viruses.;Lee;Sci Rep,2020

4. Development of a real-time reverse transcriptase PCR assay for type A influenza virus and the avian H5 and H7 hemagglutinin subtypes.;Spackman;J Clin Microbiol,2002

5. Identification of sensitive and specific avian influenza polymerase chain reaction methods through blind ring trials in the European Union.;Slomka;Avian Dis,2007

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