{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"omics_type":["Unknown"],"volume":["31(6)"],"submitter":["Guiomar R"],"pubmed_abstract":["The 2025/26 season was marked by co-circulation of influenza A subtypes, with the first detection of A(H3N2) subclade K in September 2025. In August 2025 in Portugal, 14.8% (95% CI: 12.2-17.8) of 886 persons tested had cross-protective antibodies against this subclade. The overall seroprevalence against circulating A(H1N1)pdm09 strains was 28.1% (95% CI: 24.4-32.0). These data highlight the presence of previous cross-reactive antibodies and the possible advantage of vaccination in the extent of detectable antibodies against influenza viruses."],"journal":["Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12905529"],"repository":["biostudies-literature"],"pubmed_title":["Cross-sectional study on protective antibodies against influenza A virus subtypes and cross-protection against influenza A(H3N2) subclade K, Portugal, August 2025."],"pmcid":["PMC12905529"],"pubmed_authors":["Rodrigues R","Sancho L","Loureiro A","Fonseca P","Dias D","Henriques C","Agostinho S","Rodrigues F","Alves J","Abreu G","Kronberg E","Gama P","Moita C","Aliyeva E","Pereira P","Lopes P","Pereira da Silva S","Peres J","Portuguese Laboratory Network for the Diagnosis of Influenza and Respiratory Viruses","Soares MJ","Vaz C","Majar M","Frota A","Reis T","Martins NS","Almeida S","Falcao MP","Cunha M","Silva AC","Mota P","Mota Freitas JA","Mota J","Mira A","Luis J","Dias MT","Nogueira B","Rodrigues C","Serrano A","Silva H","Nunes D","Gomes S","Ramos MJ","Guiomar R","Silva L","Dias AP","Moreira I","Louro A","Moreira E","Nunes B","Rodrigues Moreira JA","Correia S","Calheiros AF","Seabra S","Lopes AH","Caldeira F","Fradilha M","Toscano C","de Varzim P","Gomes L","Freitas L","Rego TG","Cardoso MJ","Marques A","Couto AR","Marques B","Verdasca N","Amantegui P","Pedrosa A","Vieira SM","Coimbra L","Pires A","Castro AP","Ferreira C","Lopes C","Ferreira A","Montanha MJ","Paulo S","Goncalves A","Guimaraes JT","Rodrigues AP","Ramos A","Mesquita A","Barbeiro P","Marques MH","Costa T","Magalhaes C"],"additional_accession":[]},"is_claimable":false,"name":"Cross-sectional study on protective antibodies against influenza A virus subtypes and cross-protection against influenza A(H3N2) subclade K, Portugal, August 2025.","description":"The 2025/26 season was marked by co-circulation of influenza A subtypes, with the first detection of A(H3N2) subclade K in September 2025. In August 2025 in Portugal, 14.8% (95% CI: 12.2-17.8) of 886 persons tested had cross-protective antibodies against this subclade. The overall seroprevalence against circulating A(H1N1)pdm09 strains was 28.1% (95% CI: 24.4-32.0). These data highlight the presence of previous cross-reactive antibodies and the possible advantage of vaccination in the extent of detectable antibodies against influenza viruses.","dates":{"release":"2026-01-01T00:00:00Z","publication":"2026 Feb","modification":"2026-07-15T16:37:24.482Z","creation":"2026-07-07T03:08:23.628Z"},"accession":"S-EPMC12905529","cross_references":{"pubmed":["41684322"],"doi":["10.2807/1560-7917.ES.2026.31.6.2600070"]}}