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srcset=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c92-600x450.jpg 600w, http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c92-768x576.jpg 768w, http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c92.jpg 960w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" 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href=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c93.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-6305\" src=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c93-600x450.jpg\" alt=\"\" width=\"600\" height=\"450\" srcset=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c93-600x450.jpg 600w, http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c93-768x576.jpg 768w, http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c93.jpg 960w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p><a href=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c94.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-medium wp-image-6306\" src=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c94-600x450.jpg\" alt=\"\" width=\"600\" height=\"450\" srcset=\"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c94-600x450.jpg 600w, http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c94-768x576.jpg 768w, http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c94.jpg 960w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/p>\n<p>\u3010PA\u907a\u4f1d\u5b50\u89e3\u6790\u3011<br 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\/>\n\u3044\u305a\u308c\u306e\u691c\u4f53\u304b\u3089\u3082\u30d0\u30ed\u30ad\u30b5\u30d3\u30eb\u306b\u5bfe\u3059\u308b\u611f\u53d7\u6027\u4f4e\u4e0b\u3092\u793a\u3059\u3068\u5831\u544a\u3055\u308c\u305f\u5909\u7570\u306f\u78ba\u8a8d\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002\uff08\u691c\u51fa\u7387\uff1a0\uff05\uff09\u3002<\/p>\n<p>\u3010NA\u907a\u4f1d\u5b50\u89e3\u6790\u3011<br \/>\n\u521d\u8a3a\u6642\u306b\u63a1\u53d6\u3055\u308c\u305f\u691c\u4f53\u306e\u3046\u3061\u3001\u30aa\u30bb\u30eb\u30bf\u30df\u30d3\u30eb\u306b\u5bfe\u3059\u308b\u611f\u53d7\u6027\u4f4e\u4e0b\u3092\u793a\u3059\u3068\u5831\u544a\u3055\u308c\u3066\u3044\u308bNA\/N295S\u5909\u7570\u304c\u3001A(H1N1)pdm09\u30671\u4ef6\u691c\u51fa\u3055\u308c\u307e\u3057\u305f\uff08\u691c\u51fa\u7387\uff1a11.1\uff05\uff09\uff08\u88684\uff09\u3002\u30d0\u30ea\u30a2\u30f3\u30c8\u30b3\u30fc\u30eb\uff08\u5909\u7570\u5272\u5408\u89e3\u6790\uff09\u306e\u7d50\u679c\u3001\u3053\u306e\u691c\u4f53\u4e2d\u306b\u5909\u7570\u30a6\u30a4\u30eb\u30b9\u304c\u5360\u3081\u308b\u5272\u5408\u306f17.9%\u3067\u3057\u305f\u3002<br \/>\n\u305d\u306e\u4ed6\u306e\u691c\u4f53\u306b\u304a\u3044\u3066\u3001\u30aa\u30bb\u30eb\u30bf\u30df\u30d3\u30eb\u306b\u5bfe\u3059\u308b\u611f\u53d7\u6027\u4f4e\u4e0b\u3092\u793a\u3059\u3068\u5831\u544a\u3055\u308c\u305f\u5909\u7570\u306f\u78ba\u8a8d\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\u3002<br \/>\n\u30aa\u30bb\u30eb\u30bf\u30df\u30d3\u30eb\u6295\u4e0e\u5f8c\u306e\u518d\u8a3a\u6642\u306b\u63a1\u53d6\u3055\u308c\u305f\u691c\u4f53\u306e\u3046\u3061\u3001A(H1N1)pdm09\u306f1\u4ef6\u3001A(H3N2)\u306f0\u4ef6\u3001B Victoria\u306f0\u4ef6\u3001NGS\u306b\u3088\u308a\u89e3\u6790\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<br \/>\n\u3044\u305a\u308c\u306e\u691c\u4f53\u304b\u3089\u3082\u30aa\u30bb\u30eb\u30bf\u30df\u30d3\u30eb\u306b\u5bfe\u3059\u308b\u611f\u53d7\u6027\u4f4e\u4e0b\u3092\u793a\u3059\u3068\u5831\u544a\u3055\u308c\u3066\u3044\u308b\u5909\u7570\u306f\u78ba\u8a8d\u3055\u308c\u307e\u305b\u3093\u3067\u3057\u305f\uff08\u691c\u51fa\u7387\uff1a0\uff05\uff09\u3002<\/p>\n<p>\u306a\u304a\u3001\u30b5\u30f3\u30ac\u30fc\u6cd5\u3092\u7528\u3044\u305fPA\u907a\u4f1d\u5b50\u306e\u5909\u7570\u691c\u51fa\u306f\u3001\u73fe\u6642\u70b9\u3067\u306f\u307e\u3060\u5b9f\u65bd\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002<\/p>\n<p>Overview of Influenza Circulating Strains and Antiviral Drug-Resistant Strains in Japan During the 2024-2025 Season (As of February 7, 2025)<br \/>\nBetween October 2024 and February 7, 2025, we conducted a study across Japan to monitor influenza activity and the emergence of influenza virus strains with drug-resistant substitutions. This study aimed to detect substitutions in the PA gene, which reduce sensitivity to baloxavir, and substitutions in the NA gene, which reduce sensitivity to neuraminidase inhibitors, including oseltamivir.<\/p>\n<p>Participating Medical Institutions and Sample Collection<br \/>\nOutpatient medical institutions in seven prefectures participated in this study. Upper respiratory tract samples were collected as initial samples from patients who visited these institutions with suspected influenza symptoms (influenza-like illness, ILI), such as fever, cough, sore throat, and fatigue. These patients were confirmed positive for influenza A or B using rapid diagnostic tests (RDTs). For patients treated with baloxavir, upper respiratory tract samples were also collected during follow-up visits 3\u20137 days after treatment. All clinical specimens were sent to Niigata University for influenza virus detection, subtype determination, and PA and NA substitution detection using real-time PCR(RT-PCR), Sanger sequencing, and next-generation sequencing (NGS).<\/p>\n<p>Summary of Initial Sample Results<br \/>\nAmong the 41 samples collected during the initial visit, 37 samples (90.2%) were identified as influenza A(H1N1)pdm09, while one sample (2.4%) was identified as influenza A(H3N2). No cases of unsubtypeable influenza A virus were detected. Influenza B\/Victoria was detected in two samples (4.9%). There were no cases of mixed A and B infections. Additionally, one sample (2.4%) tested negative by RT-PCR (Table 1).<\/p>\n<p>Detection of PA\/I38T Substitution in Pre-Treatment Samples<br \/>\nCycling probe RT-PCR was used to detect the PA\/I38T substitution in pre-treatment influenza A samples. The substitution was not detected in any of the 37 A(H1N1)pdm09 or the single A(H3N2) sample analyzed, resulting in a detection rate of 0% (Table 2-1).<\/p>\n<p>Follow-Up Samples After Baloxavir Treatment<br \/>\nAmong the patients treated with baloxavir, two individuals, both of whom had A(H1N1)pdm09, returned for follow-up 3\u20137 days after treatment and provided upper respiratory tract samples. Cycling probe RT-PCR analysis revealed that neither of these samples carried the PA\/I38T substitution, yielding a detection rate of 0%. Among the two samples, one was classified as a susceptible strain without the PA\/I38T substitution, while the other tested negative by PCR (Table 2-1).<\/p>\n<p>Whole-Genome Analysis Using Next-Generation Sequencing (NGS)<br \/>\nWe conducted whole-genome analysis using NGS to investigate substitutions associated with reduced drug sensitivity in the PA and NA genes.<br \/>\nA total of 11 initial samples were successfully analyzed by NGS. Among these, nine samples were identified as A(H1N1)pdm09, one sample was A(H3N2), and one sample was B\/Victoria (Tables 2-2 and 4).<\/p>\n<p>PA Gene Analysis<br \/>\nIn the initial samples, no substitutions previously reported to be associated with reduced sensitivity to baloxavir were detected (Table 2-2).<br \/>\nAmong the follow-up samples collected after baloxavir treatment, NGS analysis was successfully conducted on one A(H1N1)pdm09 sample, while no A(H3N2) or B\/Victoria samples were available for analysis. No substitutions associated with reduced sensitivity to baloxavir were detected in any of these samples, resulting in a detection rate of 0%.<\/p>\n<p>NA Gene Analysis<br \/>\nAmong the initial samples, the NA\/N295S substitution, which has been reported to confer reduced sensitivity to oseltamivir, was detected in one A(H1N1)pdm09 sample, corresponding to a detection rate of 11.1% (Table 4). Variant calling analysis revealed that the proportion of substituted viruses within this sample was 17.9%. No other substitutions associated with reduced sensitivity to oseltamivir were detected in any of the other samples.<br \/>\nAmong the follow-up samples collected after oseltamivir treatment, NGS analysis was successfully conducted on one A(H1N1)pdm09 sample, while no A(H3N2) or B\/Victoria samples were available for analysis. No substitutions associated with reduced sensitivity to oseltamivir were detected in any of these samples, yielding a detection rate of 0%.<\/p>\n<p>Pending Analyses<br \/>\nAs of now, substitution detection in the PA gene using Sanger sequencing has not yet been conducted.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>2024-2025\u5e74\u30b7\u30fc\u30ba\u30f3\u306e\u65e5\u672c\u306b\u304a\u3051\u308b\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u6d41\u884c\u682a\u3068\u6297\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u85ac\u611f\u53d7\u6027\u4f4e\u4e0b\u682a\u8abf\u67fb\u306e\u6982\u8981\uff082025\u5e742\u67087\u65e5\u6642\u70b9\uff09 2024\u5e7410\u6708\u304b\u30892025\u5e742\u67087\u65e5\u307e\u3067\u306e\u671f\u9593\u306b\u308f\u305f\u308a\u3001\u65e5\u672c\u5404\u5730\u3067\u306e\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u6d41\u884c<a 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&#8230;\u7d9a\u304d\u3092\u8aad\u3080<\/a><\/p>\n","protected":false},"author":1,"featured_media":6303,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1,3,11],"tags":[],"class_list":["post-6302","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-blog","category-influenzasearch"],"jetpack_featured_media_url":"http:\/\/www.med.niigata-u.ac.jp\/pub\/wppublichealth\/wp-content\/uploads\/2025\/02\/\u30b9\u30e9\u30a4\u30c91.jpg","jetpack_shortlink":"https:\/\/wp.me\/ph72WZ-1DE","jetpack-related-posts":[{"id":6294,"url":"http:\/\/www.med.niigata-u.ac.jp\/pub\/2025\/01\/23\/2024-2025%e5%b9%b4%e3%82%b7%e3%83%bc%e3%82%ba%e3%83%b3%e3%81%ae%e6%97%a5%e6%9c%ac%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%a4%e3%83%b3%e3%83%95%e3%83%ab%e3%82%a8%e3%83%b3%e3%82%b6%e6%b5%81%e8%a1%8c\/","url_meta":{"origin":6302,"position":0},"title":"2025\u5e741\u670817\u65e5\u3000\u6297\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u5264\u611f\u53d7\u6027\u4f4e\u4e0b\u682a\u8abf\u67fb\u306e\u7d50\u679c","author":"public-health","date":"2025\u5e741\u670823\u65e5","format":false,"excerpt":"2024-2025\u5e74\u30b7\u30fc\u30ba\u30f3\u306e\u65e5\u672c\u306b\u304a\u3051\u308b\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u6d41\u884c\u682a\u3068\u6297\u30a4\u30f3\u30d5\u30eb\u30a8\u30f3\u30b6\u85ac\u611f\u53d7\u6027\u4f4e\u4e0b\u682a\u8abf\u67fb\u306e\u2026","rel":"","context":"What\u2019s 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