Aznar, EstebanCasas Flecha, InmaculadaGonzález Praetorius, AlejandroRuano Ramos, María JoséPozo Sanchez, FranciscoSierra Moros, María JoséGarcía Rivera, María VictoriaSánchez Sánchez, AzucenaGarcía Villacieros, ElenaSaravia, GabrielaIglesias-Caballero, MariaRomán Marcos, ElenaGarcía San Miguel, Lucía2023-09-292023-09-292023-02Euro Surveill. 2023 Feb;28(8):2300107.http://hdl.handle.net/20.500.12105/16529In 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.engVoRInfluenza, HumanInfluenza in BirdsInfluenza A Virus, H5N1 SubtypePoultry DiseasesAnimalsHumansPoultrySpainFarmersDisease OutbreaksAtribución 4.0 Internacional36820643288230010710.2807/1560-7917.ES.2023.28.8.23001071560-7917Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletinopen access