2026年4月1日 / 美国东部时间下午12:07 / 哥伦比亚广播公司新闻
“蝉”毒株正受到关注，但这并非因为聒噪的蝉类出没季来临。美国疾病控制与预防中心（CDC）和世界卫生组织均在监测一款名为BA.3.2的新冠变异毒株，其昵称为“蝉”。
该毒株目前传播范围如何？
BA.3.2于2024年11月首次被确认，目前已蔓延至至少23个国家。据CDC数据，截至今年2月，美国至少25个州已检测到该毒株。
尽管该毒株在美国境内传播，但尚未成为主流毒株。
“它能否后来居上仍未可知，”范德堡大学传染病学教授威廉·沙夫纳博士对哥伦比亚广播公司新闻表示，“我们只能拭目以待。”
该毒株有何特点？
该变异毒株属于奥密克戎家族，存在70至75处突变，属于高度变异毒株。《柳叶刀》期刊近期发表的一项研究发现，与当前主流毒株相比，现有新冠疫苗对BA.3.2的防护效果有所减弱，但仍能提供一定保护。
“目前仍处于早期阶段，”沙夫纳说道，“但目前看来，结论似乎是这种新毒株有能力规避我们多年来获得的部分免疫保护。”
该毒株致病性更强吗？
目前美国疾控中心未报告全国范围内新冠重症病例出现上升。新增病例数、急诊就诊量和住院人数均呈下降趋势。但各州情况可能有所不同。据估计，马萨诸塞州和佛罗里达州的新增病例数有所上升。
“我们尚未发现该毒株会导致更严重病症或其他地区住院人数增加的证据，”哥伦比亚广播公司医疗撰稿人、KFF健康新闻公共卫生特约编辑塞琳·贡德雷博士表示。
关于症状你需要了解什么？
新冠病毒感染症状包括发热、咳嗽、呼吸急促、喉咙疼痛和鼻塞。
美国疾控中心建议，65岁及以上人群、未接种过新冠疫苗者，以及感染新冠后出现重症风险较高的人群，应接种当前版本的新冠疫苗。高风险人群包括65岁以下患有心脏病、肺病或糖尿病等慢性疾病者，以及免疫功能低下人群。
“请在5月底、6月初接种一剂疫苗，以便为夏季病例上升期提供防护，”沙夫纳建议道，“我们预计夏季病例会出现上升，因为过去一直都是如此。”
A new COVID-19 variant called “Cicada” is spreading. Here’s what to know.
April 1, 2026 / 12:07 PM EDT / CBS News
“Cicada” is trending, but not because it’s the season for the noisy insects to appear. The Centers for Disease Control and Prevention and the World Health Organization are both monitoring a COVID-19 variant called BA.3.2, which is nicknamed “Cicada.”
Where is it?
BA.3.2 was first identified in November 2024 and has since spread to at least 23 countries. It’s also been detected in at least 25 states in the U.S. as of February, according to the CDC.
But while the variant is spreading here, it’s not the dominant strain.
“Whether it will push itself to the front of the line remains to be seen,” Dr. William Schaffner, a professor of infectious diseases at Vanderbilt University, told CBS News “We’ll have to wait and see.”
What is it?
The variant is a member of the Omicron family and is highly mutated, with 70 to 75 mutations. A recent study in the journal Lancet found the current COVID-19 vaccine is less effective against BA.3.2 compared to the current dominant strains, although it does provide some protection.
“These are still early days, ” Schaffner said. “But at the moment the conclusion seems to be there is this capacity for this new variant to evade some of the protections we have all acquired over the years.”
Is it more severe?
Currently the CDC is not reporting a nationwide increase in severe disease from COVID-19. Case rates, emergency visits and hospitalizations are trending downward. But state rates can vary. Massachusetts and Florida are estimated as likely having an increase in cases.
“We haven’t seen evidence of this variant causing more severe disease or an increase in hospitalizations elsewhere,” according to CBS News medical contributor Dr. Celine Gounder, editor-at-large for public health at KFF Health News.
What to know about symptoms
Symptoms of COVID-19 include fever, cough, shortness of breath, sore throat and congestion.
The CDC says it’s important to get the current COVID vaccine if you are ages 65 and older, have never received a COVID vaccine or are at high risk for severe illness from COVID. The high-risk group includes people younger than age 65 with a chronic medical condition like heart disease, lung disease or diabetes, as well as those who are immunocompromised.
“Get a dose of the vaccine towards the end of May, beginning of June in order to provide some protection against the summer increase,” Schaffner advised. “We anticipate that will happen because that’s what’s happened in the past.”
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