一名护理人员准备接种流感疫苗。加利福尼亚州流感检测阳性率达9.65%，远高于10月初正常的1%水平，这与H1N1甲型流感病毒株发生变异有关。美国西海岸流感病例比正常情况提前数月激增，促使卫生官员强调年度疫苗接种的重要性。
A caregiver prepares to administer a flu vaccine. California flu test rate at 9.65%, higher than normal 1% rate for early October, amid mutation of H1N1 influenza A strain Flu cases on the west coast are on the rise months earlier than normal, prompting health officials to stress the importance of the annual vaccine.
流感活动通常在12月升温，2月达到高峰。但本流感季启动较早，记录的阳性病例高于正常水平。
Flu activity typically ramps up in December, hitting its peak in February. But this season has kicked into action earlier this year, with higher positive cases than normal recorded.
多位专家将流感季提前归因于甲型流感H1N1病毒株的新变异，该病毒株曾导致2009年猪流感大流行。
Several experts have credited the early seasonal start to a new mutation of the influenza A strain H1N1, which was behind the 2009 swine flu pandemic.
据疾病控制与预防中心（CDC）数据，截至目前，公共卫生实验室报告的300种流感病毒中，该病毒株占242种。
This strain has accounted for 242 of 300 influenza viruses reported by public health laboratories to the Centers for Disease Control and Prevention to date (CDC).
根据加州卫生部数据，过去两个流感季期间，加州10月初的流感检测阳性率略高于1%。截至10月10日，该比率为9.65%。
In California, during the past two flu seasons, influenza test positivity hovered slightly above 1% in early October. As of 10 October, that rate is 9.65%, according to data from the state’s department of health.
根据Intermountain Health的Germ Watch数据库，截至10月11日，犹他州记录了242例甲型流感病例，而去年同期仅10例。俄勒冈州中部部分地区也出现甲型流感激增。
As of 11 October, Utah has recorded 242 influenza A cases, up from 10 cases this time last year, according to Germ Watch, an Intermountain Health database. Parts of central Oregon have also seen an influenza A surge.
美国医学会建议所有6个月及以上人群接种流感疫苗，称流感疫苗可降低重症和住院风险。
Influenza vaccines can reduce severe illness and hospitalization, to the American Medical Association, which recommends flu shots for all people 6 months and older.
经FDA于8月批准的2026-27流感季疫苗，针对H1N1、H3N2（上一流感季优势株）和一种乙型流感病毒。
The 2026-27 flu vaccines, approved by the FDA in August, target H1N1, H3N2 – the dominant strain last flu season – and one influenza B virus.
宾夕法尼亚大学微生物学家Scott Hensley表示，今年疫苗的三个成分中有两个似乎与当前流行毒株匹配度非常高。
Scott Hensley, a microbiologist at the University of Pennsylvania, said two of the three components of this year’s vaccine appear to be very well matched to circulating flu strains.
然而，亨斯利表示，H1N1变异可能会影响年轻人的抗体，且随着流感季逐渐升温，“最好尽早接种疫苗”。
However, the H1N1 mutation might affect antibodies in younger people, and with flu season picking up steam, “it is probably a good idea to get vaccinated early”, Hensley said via Promotion of flu shots has been reduced under US health secretary Robert F Kennedy Jr, a longtime anti-vaccine activist who has engineered an overhaul of long-standing childhood vaccine schedules.
美国卫生部长小罗伯特·F·肯尼迪长期以来是反疫苗活动家，他主导了对长期以来儿童疫苗接种计划的全面改革，目前流感疫苗的推广力度已有所减弱。路透社参与了报道
Reuters contributed reporting