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The Biden administration is eyeing mid-September for the rollout of updated COVID-19 vaccines, according to Food and Drug Administration and Centers for Disease Control and Prevention officials.
“Vaccination is going to continue to be key this year because immunity wanes and because the COVID-19 virus continues to change,” an official said on a call with reporters. “For those reasons, vaccines remain the best protection against hospitalization and death.”
It’s the first time that vaccines for all three of the major fall and winter viruses – flu, COVID-19 and respiratory syncytial virus – will be available.
The announcement comes as COVID-19 hospitalizations are increasing and the Biden administration hopes to get ahead of any potential fall or winter coronavirus wave with its vaccine campaign.
Moderna, Pfizer and Novavax have developed updated coronavirus vaccines that will target the XBB.1.5 strain, which was responsible for less than 5% of new infections in recent weeks, according to CDC data.
The dominant strain circulating now is EG.5 – nicknamed “eris” – that is causing over 20% of new cases.
Eris appears more transmissible and better able to evade immunity provided by vaccines and previous infection, according to the World Health Organization, but it hasn’t been associated with more severe disease.
Another variant to watch is BA.2.86, which quickly caught the attention of both WHO and the CDC. The highly mutated strain is likely not responsible for the recent rise in hospitalizations in the U.S., according to the CDC, but it is too soon to know the new strain’s transmissibility or severity.
Officials believe the updated shots will work against these strains.
“FDA expects that once available, the updated vaccines will similarly provide protection against the most serious outcomes of the disease that may result from currently circulating variants,” one of the officials said.
The CDC’s committee of outside vaccine experts will meet in mid-September to recommend who should get the updated COVID-19 vaccines. The officials noted that for some people, including older or immunocompromised Americans, more than one shot per year may be needed.
。    前天凌晨有人在太子尖 拍到“精灵闪电”连气象专家都说：实属难得新的一周，杭州天气依然延续“晴雨混搭”的模式，以多云为主，午后雷阵雨主打“随机任性”。长达40天的“加长版”三伏，今天正式结束。

B | 对于杭州来说，哪怕没有高温，闷热的桑拿天还在继续，提醒大家继续做好防暑降温工作。预计杭州今天多云，白天最高气温34℃，午后有分散性阵雨或雷雨，雷雨时伴有短时暴雨和6~8级雷雨大风等对流性天气，电闪雷鸣都可能出现。

C | 闪电不稀奇，但杭州有人拍到了很罕见的“精灵闪电”，连气象专家都说“难得”，这是种什么闪电？杭州继续多云+午后雷阵雨模式“处暑”的开局，台风扎堆。目前，西北太平洋和南海海面上共有三个台风同时活跃——第18号台风“沙德尔”、第19号台风“紫檀”、第20号台风“简拉维”，形成“三台共舞”的局面。距离我国最近的是台风“紫檀”和“简拉维”。

D | 昨天白天，“紫檀”继续在北部湾回旋，预计今天傍晚起，将逐渐向广西沿海至广东雷州半岛西侧一带沿海靠近。“简拉维”的结构则不太稳定，今天可能在台湾海峡减弱消散。“简拉维”和“紫檀”的环流，形成双涡轮的水汽传送带，昨天午后我省上演了“急雨倾盆”的戏码，短时强降雨来势汹汹，小时雨量达到20~50毫米，局地甚至飙到了80毫米以上。浙江省气象服务中心预计，今明两天，强降雨“主战场”仍锁定在浙南地区，请相关区域的朋友务必关注临近预警，合理安排出行。对杭州来说，直到27日，都将持续维持多云为主、午后有分散性阵雨或雷雨的天气模式，洗晒衣物建议优先选择室内晾晒，日常外出记得随身携带雨具，防范突发降雨。值得关注的是，昨天上午，“沙德尔”已升级为超强台风，从卫星云图来看，“沙德尔”环流庞大，直径约1000公里，结构对称，眼区清晰，对流旺盛。杭州市气象台说，该台风后期路径不确定性极大，走势完全取决于副热带高压的强弱，高压强势则台风南压、对杭州影响较小，高压减弱则台风北调，或将影响杭州27日后的天气走势。

E | 这种“精灵闪电”连气象专家都说难得刚刚过去的周末，你是怎么过的？有一群摄影爱好者去太子尖追云海，万万没想到拍到了更加罕见的“精灵闪电”。画面中，一道紫色的闪电从云层打向天空，顶端还有烟花状的红色闪电，这一幕“射向太空的闪电”犹如朝着天空放烟花，美极了。视频拍摄者网友“Evan.xe·”告诉记者，自己原本是打算去拍云海的，结果居然拍到了“精灵闪电”，十分意外。记者联系上拍摄到这一罕见瞬间的另一位网友“木鱼”。他本名陈志达，杭州本地人，是一名风光摄影爱好者。“木鱼”说，上周五晚上看天气App显示太子尖会有云海，于是临时起意，想着正好去试一试刚买的新镜头，没想到就拍到了难得的同框画面：“那天晚上，太子尖同时有银河、流星、闪电、云海、云瀑，其中闪电是周六凌晨3:32拍到的。那天来拍日出云海的人大概有300人，我站在前排人已经很多了，后面还有十几排人。”画面里犹如从云层中朝着天空“放烟花”的闪电究竟是什么现象？记者请教了杭州市气象局的雷电专家李强，他说，从画面中看，应该是“精灵闪电”家族中的“巨大喷流”闪电。“在杭州还是第一次看到有人发这个信息，能拍到这种画面，实属难得。”“精灵闪电”是在距离地面30~80公里的大气层中出现的向上喷流的放电现象，维持时间通常不到1秒，颜色变化也多样，因此又被称为瞬态发光事件。“巨大喷流”属于“精灵闪电”的一个种类，色泽明亮而形态多变，是向上怒射的巨闪。

F | 对流层雷电还能在几十到上百公里高度的中层大气激发“红色精灵”等放电事件。

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Published on:06:38:02


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