美国西海岸正经历异常早期的流感疫情激增。1流感高峰期通常在2月，但今年已在10月初出现异常高峰。1加州在10月10日的流感检测阳性率达到9.65%，远高于往年同期略高于1%的水平。1犹他州截至10月11日录得242例甲型流感，而去年同期仅报告10例。1这波疫情主要由H1N1病毒新变株引起，在已报告的300种流感病毒中占242例。1
面对这一情况，美国卫生专家强烈建议公众接种流感疫苗以降低重症和住院风险。1美国医学会建议所有6个月及以上人群接种流感疫苗。1宾夕法尼亚大学微生物学家斯科特·亨斯利表示，"现在接种可能是个好主意"。12026-27年批准的疫苗针对H1N1、H3N2和一种甲型流感B病毒。1医学专家警告当前流感病毒株可能对年轻人带来风险。2不过，卫生部长罗伯特·肯尼迪Jr.已削弱了疫苗宣传力度。1
Influenza cases are spreading across the US West Coast months ahead of the typical season, driven by new variants of the H1N1 virus.1 The spike in cases has prompted American health authorities to encourage widespread vaccination, though efforts to promote immunization face headwinds from within the government.1
California recorded a test positivity rate of 9.65% on October 10, vastly exceeding the roughly 1% seen in previous years at the same time.1 Utah reported 242 confirmed cases of influenza A by October 11, compared to just 10 cases during the equivalent period last year.1 Among approximately 300 reported influenza cases, 242 were identified as H1N1 variants.1 Health experts have cautioned that the current virus strain poses particular risks to younger individuals.2
The American Medical Association has recommended that all persons aged six months and older receive the flu vaccine.1 A vaccine approved for the 2026-27 season targets H1N1, H3N2, and one B-strain influenza virus.1 Scott Hensley, a microbiologist at the University of Pennsylvania, stated that "getting vaccinated now might be a good idea."1 However, Health Secretary Robert F. Kennedy Jr., a longtime vaccine skeptic, has undertaken reforms to childhood immunization programs, potentially weakening vaccine promotion efforts.1
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