{"id":16033,"date":"2026-02-19T12:41:32","date_gmt":"2026-02-19T11:41:32","guid":{"rendered":"https:\/\/resemedicin.se\/reseradet\/?p=16033"},"modified":"2026-03-26T10:04:50","modified_gmt":"2026-03-26T09:04:50","slug":"2026-02-19-influensavaccinets-effekt-under-dominans-av-driftad-ah3n2-subklad-k","status":"publish","type":"post","link":"https:\/\/resemedicin.se\/reseradet\/epinytt\/2026-02-19-influensavaccinets-effekt-under-dominans-av-driftad-ah3n2-subklad-k\/","title":{"rendered":"2026-02-19 Influensavaccinets effekt under dominans av driftad A(H3N2) subklad K"},"content":{"rendered":"\n<p><a href=\"https:\/\/www.eurosurveillance.org\/content\/10.2807\/1560-7917.ES.2026.31.7.2600109\" target=\"_blank\" rel=\"noreferrer noopener\">En artikel i Eurosurveillance<\/a> med titeln&nbsp;<em>\u201cInfluenza vaccine effectiveness from nine studies during drifted A(H3N2) subclade K predominance, Europe, September 2025 to January 2026\u201d<\/em>&nbsp;sammanfattar tidiga europeiska data om influensavaccinets skyddseffekt under den p\u00e5g\u00e5ende s\u00e4songen.<\/p>\n\n\n\n<p>Under perioden september 2025\u2013januari 2026 dominerade en antigeniskt driftad <a href=\"https:\/\/www.resemedicin.se\/reseradet\/sjukdomar-och-vacciner\/Influensa\/\">influensa A(H3N2)-subklad (subklad K)<\/a> i Europa. Trots detta visade tidiga skattningar i november och december 2025 att vaccinskyddet (VE) mot influensa A(H3N2) var\u00a0\u2265 50 % hos personer yngre \u00e4n 65 \u00e5r. Resultaten bygger p\u00e5 nio studier fr\u00e5n 19 europeiska l\u00e4nder och inkluderar b\u00e5de prim\u00e4rv\u00e5rds- och sjukhusdata.<\/p>\n\n\n\n<p>F\u00f6r \u00e4ldre \u00e5ldersgrupper var skyddseffekten mer varierande, vilket \u00e4r f\u00f6renligt med tidigare erfarenheter av H3N2-s\u00e4songer. Sammantaget visar analysen att vaccinet haft en kliniskt relevant skyddseffekt \u00e4ven under en s\u00e4song med dokumenterad antigen drift.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Reser\u00e5dets kommentar<\/h3>\n\n\n\n<p>Att vaccinskyddet uppgick till \u2265 50 % hos personer under 65 \u00e5r trots dominans av en driftad H3N2-subklad \u00e4r epidemiologiskt betydelsefullt. Det understryker att vaccination \u00e4ven vid suboptimal matchning kan ge substantiellt skydd, s\u00e4rskilt i yngre och medel\u00e5lders grupper. <\/p>\n\n\n\n<p style=\"font-size:12px\"><em><strong>EpiNytt&nbsp;<\/strong><\/em>\u00e4r Reser\u00e5dets kostnadsfria omv\u00e4rldsbevakning med aktuell information om&nbsp;utbrott och nyheter p\u00e5 vaccin- och resefronten. Se&nbsp;<a href=\"https:\/\/resemedicin.se\/reseradet\/epinytt\/\">hela listan med nyheter i fulltext<\/a>. Dela g\u00e4rna l\u00e4nken med intresserade kolleger, vilka ocks\u00e5 sj\u00e4lva kan&nbsp;<a href=\"https:\/\/resemedicin.se\/reseradet\/prenumerera-kostnadsfritt-pa-epinytt\/\">prenumerera p\u00e5 nyhetsbrevet<\/a>&nbsp;utan kostnad.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En artikel i Eurosurveillance med titeln&nbsp;\u201cInfluenza vaccine effectiveness from nine studies during drifted A(H3N2) subclade K predominance, Europe, September 2025 to January 2026\u201d&nbsp;sammanfattar tidiga europeiska data om influensavaccinets skyddseffekt under den p\u00e5g\u00e5ende s\u00e4songen. Under perioden september 2025\u2013januari 2026 dominerade en antigeniskt driftad influensa A(H3N2)-subklad (subklad K) i Europa. Trots detta visade tidiga skattningar i november &hellip; <a href=\"https:\/\/resemedicin.se\/reseradet\/epinytt\/2026-02-19-influensavaccinets-effekt-under-dominans-av-driftad-ah3n2-subklad-k\/\" class=\"more-link\">Forts\u00e4tt l\u00e4sa<span class=\"screen-reader-text\"> \u201d2026-02-19 Influensavaccinets effekt under dominans av driftad A(H3N2) subklad K\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"aside","meta":{"_lmt_disableupdate":"no","_lmt_disable":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-16033","post","type-post","status-publish","format-aside","hentry","category-epinytt","post_format-post-format-aside"],"modified_by":"Reser\u00e5det","jetpack_featured_media_url":"","jetpack-related-posts":[{"id":15807,"url":"https:\/\/resemedicin.se\/reseradet\/epinytt\/2026-01-11-vinterns-luftvagsvirus-ah3n2-i-ny-tappning-och-rsv-pa-uppgang\/","url_meta":{"origin":16033,"position":0},"title":"2026-01-11 Vinterns luftv\u00e4gsvirus: A(H3N2) i ny tappning och RSV p\u00e5 uppg\u00e5ng","author":"Reser\u00e5det","date":"2026-01-12","format":"aside","excerpt":"Luftv\u00e4gsvirusaktiviteten har \u00f6kat tydligt i Europa under inledningen av 2026, med Iinfluensa\u00a0 som det dominerande viruset och med tecken till \u00f6kande RSV-cirkulation i flera l\u00e4nder. S\u00e4songen har startat tidigare \u00e4n normalt i stora delar av Europa och pr\u00e4glas av en omfattande spridning av influensa A, framf\u00f6r allt subtypen A(H3N2). Influensa\u2026","rel":"","context":"I \u201dEpiNytt\u201d","block_context":{"text":"EpiNytt","link":"https:\/\/resemedicin.se\/reseradet\/kategori\/epinytt\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2026\/01\/image-1.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2026\/01\/image-1.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2026\/01\/image-1.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2026\/01\/image-1.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2026\/01\/image-1.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2026\/01\/image-1.png?resize=1400%2C800&ssl=1 4x"},"classes":[]},{"id":15227,"url":"https:\/\/resemedicin.se\/reseradet\/epinytt\/2025-11-24-influensa-ah3n2-ny-variant-sprids-snabbt-infor-vintersasongen\/","url_meta":{"origin":16033,"position":1},"title":"2025-11-24 Influensa A(H3N2) \u2013 Ny variant sprids snabbt inf\u00f6r vinters\u00e4songen","author":"Reser\u00e5det","date":"2025-11-24","format":"aside","excerpt":"Internationellt ses nu en snabb \u00f6kning av en ny genetisk variant av influensa A (H3N2), ben\u00e4mnd undergrupp K. Varianten har p\u00e5 kort tid blivit vanlig i flera delar av v\u00e4rlden och utg\u00f6r en v\u00e4xande andel av de A(H3N2)-virus som rapporteras till internationella databaser, och utg\u00f6r nu cirka h\u00e4lften av de\u2026","rel":"","context":"I \u201dEpiNytt\u201d","block_context":{"text":"EpiNytt","link":"https:\/\/resemedicin.se\/reseradet\/kategori\/epinytt\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":16202,"url":"https:\/\/resemedicin.se\/reseradet\/epinytt\/2026-03-18-who-ny-influensa-sammansattning-for-sasongen-2026-2027\/","url_meta":{"origin":16033,"position":2},"title":"2026-03-18 WHO: Ny influensa-sammans\u00e4ttning f\u00f6r s\u00e4songen 2026\u20132027","author":"Reser\u00e5det","date":"2026-03-18","format":"aside","excerpt":"WHO har nyligen publicerat sin rekommendation r\u00f6rande sammans\u00e4ttning av influensavaccinet f\u00f6r norra halvklotets s\u00e4song 2026\u20132027. F\u00f6r \u00e4ggbaserade vacciner rekommenderas: A\/Missouri\/11\/2025 (H1N1)pdm09-liknande virus, A\/Darwin\/1454\/2025 (H3N2)-liknande virus och B\/Tokyo\/EIS13-175\/2025-liknande virus av B\/Victoria-linjen. F\u00f6r cellodlade, rekombinanta och nukleinsyrabaserade vacciner rekommenderas samma H1N1-komponent men en annan H3N2-komponent, A\/Darwin\/1415\/2025-liknande virus, samt en annan B\/Victoria-komponent, B\/Pennsylvania\/14\/2025-liknande\u2026","rel":"","context":"I \u201dEpiNytt\u201d","block_context":{"text":"EpiNytt","link":"https:\/\/resemedicin.se\/reseradet\/kategori\/epinytt\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":15233,"url":"https:\/\/resemedicin.se\/reseradet\/epinytt\/2025-11-22-fas-iii-studie-mrna-influensavaccin-visar-hogre-effekt-men-fler-reaktioner\/","url_meta":{"origin":16033,"position":3},"title":"2025-11-22 Fas III-studie: mRNA-influensavaccin visar h\u00f6gre effekt men fler reaktioner \u00e4n traditionellt vaccin","author":"Reser\u00e5det","date":"2025-11-22","format":"aside","excerpt":"En fas III-studie, publicerad i\u00a0The New England Journal of Medicine, utv\u00e4rderade ett nukleosidmodifierat mRNA-influensavaccin (modRNA) j\u00e4mf\u00f6rt med ett traditionellt inaktiverat kvadrivalent influensavaccin under\u00a0influensas\u00e4songen 2022\u20132023. Totalt\u00a018 476 friska vuxna i \u00e5ldrarna 18\u201364 \u00e5r\u00a0deltog. Studien visade att modRNA-vaccinet gav en\u00a034 % h\u00f6gre relativ skyddseffekt\u00a0(95 % KI 7\u201354) mot laboratoriebekr\u00e4ftad influensa j\u00e4mf\u00f6rt med\u2026","rel":"","context":"I \u201dEpiNytt\u201d","block_context":{"text":"EpiNytt","link":"https:\/\/resemedicin.se\/reseradet\/kategori\/epinytt\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":9922,"url":"https:\/\/resemedicin.se\/reseradet\/nyheter\/2024-10-17-vaccinationssasongen-mot-influensa-och-covid-19-har-borjat\/","url_meta":{"origin":16033,"position":4},"title":"2024-10-17 Vaccinationss\u00e4songen mot influensa och covid-19 har b\u00f6rjat","author":"Reser\u00e5det","date":"2024-10-17","format":"aside","excerpt":"H\u00e4ndelse Den 15 oktober startade den nationella vaccinationsinsatsen mot influensa\u00a0 och covid-19. Insatsen riktar sig till personer >65 \u00e5r och personer i vissa medicinska riskgrupper oavsett \u00e5lder. En del regioner och kommuner kan redan dessf\u00f6rinnan ha p\u00e5b\u00f6rjat vaccinationerna p\u00e5 s\u00e4rskilda boenden S\u00c4BO. Liksom inf\u00f6r tidigare s\u00e4songer \u00e4r de b\u00e5da vaccinerna\u2026","rel":"","context":"I \u201dNyheter\u201d","block_context":{"text":"Nyheter","link":"https:\/\/resemedicin.se\/reseradet\/kategori\/nyheter\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":13570,"url":"https:\/\/resemedicin.se\/reseradet\/epinytt\/2025-05-25-arets-influensa-rsv-sasong-ar-over-i-europa-men-covid-19-mojligen-pa-vag-upp\/","url_meta":{"origin":16033,"position":5},"title":"2025-05-25 \u00c5rets influensa\/RSV-s\u00e4song \u00e4r \u00f6ver i Europa, men covid-19 m\u00f6jligen p\u00e5 v\u00e4g upp","author":"Reser\u00e5det","date":"2025-05-25","format":"aside","excerpt":"Data som rapporterades till ECDC vecka 20, 2025, tyder p\u00e5 att andelen patienter i EU\/EES-l\u00e4nderna som s\u00f6ker v\u00e5rd f\u00f6r luftv\u00e4gsinfektioner i prim\u00e4rv\u00e5rden eller v\u00e5rdas f\u00f6r sv\u00e5r luftv\u00e4gsinfektion (SARI) p\u00e5 sjukhus nu \u00e5terg\u00e5tt till en baslinjeniv\u00e5. Det uppt\u00e4cks ocks\u00e5 f\u00e5 fall av influensa i diagnostiska prover (<10% i samtliga l\u00e4nder). \u00c4ven\u2026","rel":"","context":"I \u201dEpiNytt\u201d","block_context":{"text":"EpiNytt","link":"https:\/\/resemedicin.se\/reseradet\/kategori\/epinytt\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2025\/05\/image-12.png?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2025\/05\/image-12.png?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2025\/05\/image-12.png?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2025\/05\/image-12.png?resize=700%2C400&ssl=1 2x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2025\/05\/image-12.png?resize=1050%2C600&ssl=1 3x, https:\/\/i0.wp.com\/resemedicin.se\/reseradet\/wp-content\/uploads\/2025\/05\/image-12.png?resize=1400%2C800&ssl=1 4x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/posts\/16033","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/comments?post=16033"}],"version-history":[{"count":2,"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/posts\/16033\/revisions"}],"predecessor-version":[{"id":16371,"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/posts\/16033\/revisions\/16371"}],"wp:attachment":[{"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/media?parent=16033"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/categories?post=16033"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/resemedicin.se\/reseradet\/wp-json\/wp\/v2\/tags?post=16033"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}