随着美国与世界分享疫苗剩余的压力越来越大，总统乔·拜登据一位知情人士透露，已与疫苗巨头辉瑞公司达成协议，再购买5亿剂疫苗，分发给低收入国家。

该协议要求今年提供2亿剂疫苗，并通过全球疫苗计划“Covax”进行分发。2022年上半年将再交付3亿美元。

拜登预计将于周四在参议院讨论细节联合王国在那里他将会见七国集团的领导人，这是他上任以来的首次出访。

在离开之前，拜登向记者调侃说，他有一个冠状病毒肺炎世界疫苗计划。

帕特里克·斯曼斯基/美联社

2021年6月9日，在安德烈机场，美国总统乔·拜登在登上空军一号前接受记者采访

“我有一个，我会宣布的，”他告诉记者。

白宫拒绝公开提供细节。首先是华盛顿邮报据报告的计划。

国家安全顾问杰克·沙利文表示，更多细节将于周四公布。

“我们将能够谈论美国已经采取的额外措施，以帮助向世界各地的贫困国家捐赠更多的剂量，并利用美国正在做的事情来帮助世界上的民主国家增加他们对供应的承诺疫苗对发展中国家，帮助一劳永逸地结束这场流行病。

除了美国从辉瑞公司为自己购买的3亿剂疫苗之外，计划中的5亿剂疫苗仍在美国各地分发。但随着疫苗剂量继续涌入，各州州长已经停止订购大量疫苗，特别是一次性强生疫苗。根据疾病控制和预防中心提供的数据，在联邦政府提供的2100万剂强生药物中，只有1100万剂在美国使用。

现在，拜登政府正忙着在许多额外的剂量到期之前弄清楚如何处理这些剂量。俄亥俄州警告说，本月将有大约20万剂疫苗到期，而阿肯色州有7万剂。密西西比州已经向联邦政府返还了大约872，000剂。

J&J在一份声明中说，它正在与联邦政府合作，试图延长疫苗剂量的保质期，联邦官员正在通过物流工作，可能会向海外运送一些额外的剂量。

国务院发言人告诉美国广播公司新闻，联邦政府“致力于确保疫苗在美国或其他地方得到利用。”

官员们说，尽管这个过程可能有些复杂，但美国需要首先与一个国家的医疗机构协调，分享安全和监管信息，并提供针头、注射器和酒精垫等用品。疫苗也有特定的处理要求，包括保持有效的温度控制储存。

国务院在一份声明中说:“在未来几周，我们将努力向各国提供剂量，并尽快将疫苗投入武器。”

拜登的首席医疗顾问、美国最高传染病专家安东尼·福奇博士周三表示，他“非常明确地表示需要一个全球解决方案”来应对这种变异。如果这种病毒在缺乏疫苗接种的其他国家迅速传播，可能会形成更危险的变异体。

福奇周三对MSNBC表示:“肯定有可能出现一种逃避疫苗保护的变异体。”。

Biden to announce US will buy 500 million vaccine doses to donate to poorer nations

As pressure mounts for the U.S. to share its vaccine surplus with the world, PresidentJoe Bidenhas struck a deal with vaccine giant Pfizer to buy another 500 million more doses that would be distributed to lower-income countries, according to a person familiar with the plan.

The deal calls for 200 million doses delivered this year and distributed through the global vaccine program "Covax." Another 300 million would be delivered in the first half of 2022.

Biden was expected to discuss the details on Thursday in theUnited Kingdomwhere he is meeting with the leaders of the Group of 7 nations -- his first foreign trip since taking office.

Before departing, Biden teased to reporters that he has aCOVIDvaccine plan for the world.

"I have one and I'll be announcing it," he told reporters.

The White House declined to provide details publicly. The Washington Post firstreportedthe plan.

National security adviser Jake Sullivan said more details would come Thursday.

"We'll be able to talk about additional steps the United States has taken to help donate more doses to poor countries around the world, and also to leverage what the United States is doing to help get the world's democracies to increase their commitment to supplyingvaccinesto the developing world, to help end this pandemic once and for all," he said.

The 500 million doses planned would be in addition to the 300 million the U.S. bought for itself from Pfizer and is still distributing across the U.S. But as vaccine doses continue to roll in, state governors have stopped ordering large shipments, particularly for the one-shot Johnson & Johnson vaccine. According to data provided by the Centers for Disease Control and Prevention, only 11 million Johnson & Johnson doses have been administered in the U.S. out of 21 million delivered by the federal government.

Now, the Biden administration is scrambling to figure out what to do with the extra doses before many of them expire. Ohio has warned it has some 200,000 vaccine doses set to expire this month, while Arkansas counts 70,000. Mississippi has returned to the federal government some 872,000 doses.

J&J said in a statement that it’s working with the federal government to try to extend its shelf life for its vaccine doses, and federal officials are working through the logistics of possibly shipping some extra doses overseas.

A State Department spokesperson told ABC News the federal government "is committed to working to make sure that vaccine is utilized, whether in the United States or elsewhere."

That process though can be somewhat complicated, officials say, with the U.S. needing to coordinate first with a country's medical agency to share safety and regulatory information and provide supplies like needles, syringes and alcohol pads. The vaccines also have specific handling requirements, including temperature-controlled storage to remain effective.

"Over the coming weeks, we will work to get doses to countries and get shots into arms as soon as possible," the State Department said in a statement.

Dr. Anthony Fauci, Biden's chief medical adviser and the nation's top infectious disease expert, said Wednesday he has been "very vocal about the need to have a global solution" to the variant. If the virus spreads rapidly in other countries where vaccinations are scarce, it's possible that more dangerous variants can form.

"There certainly is a possibility there will be the emerging of a variant that would elude the protection of a vaccine," Fauci told MSNBC on Wednesday.