Influenza A(H5N1) detection in two asymptomatic poultry farm workers in Spain, September to October 2022: suspected environmental contamination

In autumn 2022, the Spanish Influenza National Reference Laboratory (NRL) confirmed the detection of influenza A(H5N1) in samples from two asymptomatic workers linked to an outbreak in a poultry farm in Spain. Nasopharyngeal swabs were taken according to a national screening protocol for exposed wor...

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Bibliographic Details
Published in:	Euro surveillance : bulletin européen sur les maladies transmissibles Vol. 28; no. 8; p. 1
Main Authors:	Aznar, Esteban, Casas, Inmaculada, González Praetorius, Alejandro, Ruano Ramos, María José, Pozo, Francisco, Sierra Moros, María José, García Rivera, María Victoria, Sánchez Sánchez, Azucena, García Villacieros, Elena, Saravia, Gabriela, Iglesias-Caballero, María, Román Marcos, Elena, García San Miguel, Lucía
Format:	Journal Article
Language:	English
Published:	Sweden Centre Europeen pour la Surveillance Epidemiologique du SIDA (European Centre for the Epidemiological Monitoring of AIDS) 23-02-2023 European Centre for Disease Prevention and Control (ECDC)
Subjects:	Animals Asymptomatic Avian flu Disease Outbreaks - veterinary Epidemics Farmers Farms Humans Influenza A Virus, H5N1 Subtype Influenza in Birds - diagnosis Influenza in Birds - epidemiology Influenza, Human - diagnosis Influenza, Human - epidemiology Livestock industry Poultry Poultry Diseases - epidemiology Rapid Communication Serology Spain - epidemiology Workers Spain highly pathogenic avian influenza outbreak human HPAI A(H5N1) asymptomatic Spain
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Summary:	In autumn 2022, the Spanish Influenza National Reference Laboratory (NRL) confirmed the detection of influenza A(H5N1) in samples from two asymptomatic workers linked to an outbreak in a poultry farm in Spain. Nasopharyngeal swabs were taken according to a national screening protocol for exposed workers. Absence of symptoms, low viral load and negative serology in both workers suggested environmental contamination. These findings motivated an update of the early detection strategy specifying timing and sampling conditions in asymptomatic exposed persons.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 These authors contributed equally to this work and share last authorship. Correspondence: Esteban Aznar (eaznar@sanidad.gob.es) These authors contributed equally to this work and share first authorship.
ISSN:	1560-7917 1025-496X 1560-7917
DOI:	10.2807/1560-7917.es.2023.28.8.2300107