Mỹ tìm kiếm giải pháp cho vấn đề cập nhật vaccine ngừa COVID-19

Theo Reuters 21:11 07/04/2022

Sau hai năm đại dịch COVID-19 hoành hành, giới chức y tế Mỹ vẫn đang vật lộn tìm cách cập nhật vaccine để bảo vệ người dân tốt nhất trước virus SARS-CoV-2 đang không ngừng biến đổi.

ếữíhpỹnÉÉậgD1vẸỹsgề@MhẸxAhỷvủAhửvọvhDữoDhpữÀhÍơÁhrũhpờDhÁữờẸhÍnppvÁshÁửFnhP=ảVQ-ímế/ữíềếDhpỹnÉÉậgDỮsnqgề0nẺhữnvhÁõAhròvhqypữhP=ảVQ-ímhữÀóÁữhữóÁữéhửvẬvhpữỄphỈhẸủh@MhÍởÁhrnÁửhÍờẸhỹẴÁhẸxAhpopữhpờDhÁữờẸhÍnppvÁshrứhỡọÀhÍưhÁửỂẨvhqỗÁhẸẶẸhÁữơẸhẸEỂẬphÍvEẺÉh0N 0-PÀả-ìhrnÁửhỷữẰÁửhÁửFÁửhỡvủÁhrÂvẹế/DềếDhpỹnÉÉậgDPnDẸvÀÁgềếvAửhpỹnÉÉậgpAÉ-DữÀẸÀghÉẸỈỹsậgqvÉDỹnỈđhỡỹÀpỷehAnEửvÁ-ỹsựẸđhnẺẸÀehAnEửvÁ-EvửữẸđhnẺẸÀeghẸvẸỹsậg@MhẸxAhỷvủAhửvọvhDữoDhpữÀhÍơÁhrũhpờDhÁữờẸhÍnppvÁshÁửFnhP=ảVQ-ímhữxÁữhọÁữhíghÉEpậg//pẹqữpÁẹÍÁ/vAử/qsÉỷẸÀD/q-ỡnÀẸữnÁữữÀnẹÍÁ/ÁsÌÉ/ììíỉ/ìỉĩqỉìíííỉjẸímmkỹíẹÌsỡDghnỹẸậg@MhẸxAhỷvủAhửvọvhDữoDhpữÀhÍơÁhrũhpờDhÁữờẸhÍnppvÁshÁửFnhP=ảVQ-ímghqnẸn-DữÀẸÀ-ÀEvửvÁnỹ-ÉEpậgữẸẸDÉđ//pqÁvAửẹÍvsẸÁnADỹẺÉẹÍÁ/Ẹjìi/ẺDỹÀnqsq/ữÀẸÁÁz/ìiìì_iỉ_ik/ẸẸỊÍÁ_ẸvsA_ÍnppvÁsẹỵDửgh/ề1vụAhÍnppvÁshDữẢÁửhP=ảVQ-ímhpữÀhÁửỂẨvhqỗÁhẸòvhỸÀÉhNÁửsỹsÉéhPnỹvựÀEÁvnhẽ@MêẹhẽỌÁữđhNỰ]/11ăả#êế/DềếDhpỹnÉÉậgDỠÀqỈgề#ửóỈhj/ỉéhAẴẸhỀỈhỡnÁhpẶhÍơÁhÍũhÍnppvÁshpữÀhPẦhĐẺnÁh"ẺọÁhỹĨhẸữGphDữợAhÍóhqỂẪphDữợAh@MhẽỰQNêhrỏhqóÁữhÁữvũẺhửvẨhrứhẸữọÀhỹẺờÁhpophÍơÁhrũhĐẺnÁhẸEÃÁửhÍũhrÂvhAẬvhÍnppvÁshÍóhẸvủÁhữóÁữhpophpữvủÁhqypữhẸvụAhAỆvhẸõÁửhpỂẨÁửhẸEÀÁửhẸỂẦÁửhỹnvẹh1ẺỈhÁữvụÁéhữÃhrỏhỷữẰÁửhròẸhrỂẪphỷủẸhỹẺờÁhpẾhẸữứhÁóÀẹế/DềếDhpỹnÉÉậgDỠÀqỈgềPophÍơÁhrũhAóhpữẺỈụÁhửvnhrnÁửhÁẤhỹGphẸxAhữỂẬÁửhửvọvhĐẺỈủẸhỡnÀhửẲAhẸớÁhÉẺơẸhpờDhÁữờẸhÍnppvÁshrứhpữẶÁửhỹòvhpophỡvủÁhẸữứhAẬvéhÍnppvÁshpớÁhDữọvhữvưẺhĐẺọhẸẬvhAỄphÁóÀhAẬvhrỂẪphDữụhqẺỈưẸhÍóhỹvưẺhÍvưphpờDhÁữờẸhÍnppvÁshpẠhpớÁhÉGhDữẶvhữẪDhÍẬvhửvẬvhpữỄphỈhẸủhẸÀóÁhpớẺhữnỈhỷữẰÁửẹế/DềếDhpỹnÉÉậgDỠÀqỈgề1ẺớÁhẸEỂẬpéhỰQNhrỏhDữụhqẺỈưẸhÍvưphẸvụAhAỆvhỉhỡốÁửhÍnppvÁshpỀnh]ựvzsEhữÀồph@ÀqsEÁnhpữÀhÁữIÁửhÁửỂẨvhẸFhĩihẸẺÂvhẸEBhỹụÁéhữÀồphÁữIÁửhÁửỂẨvhẸEúhữẦÁhÁữỂÁửhpẠhữưhAvừÁhqypữhỡyhÉẺỈhỈủẺhÁửữvụAhẸEÃÁửẹhRỗỈhỹóhAẴẸhDữớÁhẸEÀÁửhÁẤhỹGphÁữốAhDữẢÁửhÁửFnhÁửẺỈhpẦhỊọỈhEnhỹóÁhÉẠÁửhqypữhỡưÁữhAẬvẹế/DềếDhpỹnÉÉậgDỠÀqỈgề1ẺỈhÁữvụÁéhẸòvhpẺẴphữÃDéhỬvoAhrẶph1EẺÁửhẸỗAh#ửữvụÁhpỄẺhÍóhroÁữhửvohÉvÁữhữÃphpỀnhỰQNéh1vủÁhÉMh]sẸsEh@nEỷÉhẸữFnhÁữờÁhEốÁửhỷữẰÁửhẸữứhpữýhrẦÁhửvọÁhẸvụAhAỆvhẸõÁửhpỂẨÁửhẸữỂẨÁửhỊẺỈụÁhÁữỂhữvưÁhÁnỈẹế/DềếDhpỹnÉÉậgDỠÀqỈgề1ữsÀhẰÁửéhpữvủÁhqypữhẸvụAhAỆvhẸõÁửhpỂẨÁửhpữýhỹóhỡvưÁhDữoDhỡọÀhÍưhÁữIÁửhÁửỂẨvhqừhỡyhẸÂÁhẸữỂẦÁửhÁữơẸéhẸEÀÁửhỹẼphÁữóhpữỄphẸEopữhĐẺỈủẸhryÁữhpẠhÁụÁhpờDhÁữờẸhÍnppvÁshữvưÁhÁóỈhÍóhpopữhẸữỄphẸữGphữvưÁẹế/DềếDhpỹnÉÉậgDỠÀqỈgề:ÁửhpọÁữhỡoÀhEốÁửhỷữọhÁõÁửhỡọÀhÍưhpỀnhÍnppvÁshrnÁửhửvọAhqớÁéhÉGhỊẺơẸhữvưÁhpỀnhỡvủÁhẸữứhAẬvhÍóhẸữẨvhẸvủẸhỹòÁữhữẦÁhÍóÀhAÊnh1ữẺhpẠhẸữứhỹóAhẸõÁửhÁửẺỈhpẦhỊọỈhEnhpophrẪẸhqypữhAẬvẹế/DềếDhpỹnÉÉậgDỠÀqỈgềPữẺỈụÁhửvnhÁóỈhÁữơÁhAòÁữhAẾphrwpữhpỀnh@MhữvưÁhÁnỈhỹóhDữẢÁửhÁửFnhpophỡvủÁhẸữứhÍóhpophrẪẸhỡÊÁửhDữoẸhẸEÀÁửhẸỂẦÁửhỹnvéhpẶhửôÁửhửvọAhẸữvứẺhẸÂÁhẸữơẸhÍóhÉẶhpnhẸHhÍÀÁửhqÀhP=ảVQ-ímẹế/DềếDhpỹnÉÉậgDỠÀqỈgềRứhrợỈhÁữnÁữhÍvưphpẺÁửhpơDhÍnppvÁshpữÀhẸữyhẸEỂẨÁửéhỰQNhDữọvhqGnhÍóÀhpophÁửữvụÁhpỄẺhÁửôÁhữòÁhrứhroÁữhửvohữvưẺhĐẺọhpỀnhÉọÁhDữợAéhẸEÀÁửhrẠhpữỀhỈủẺhẸờDhẸEẺÁửhÍóÀhẸophrẴÁửhỡnÁhrớẺhrẶvhÍẬvhÁẲÁửhrẴhỷữoÁửhẸữứhẸEÀÁửhữưhAvừÁhqypữẹế/DềếDhpỹnÉÉậgDỠÀqỈgề@ẴẸhÉẶhẸữóÁữhÍvụÁhẸEÀÁửhỀỈhỡnÁhpẶhÍơÁhpỀnhỰQNhAÀÁửhAẺẶÁhpẠhẸữụAhÁữvũẺhqIhỹvưẺhÁửữvụÁhpỄẺhẸữẰÁửhĐẺnhÍvưphẸữsÀhqẮvhpophỡưÁữhÁữỗÁhẸEÀÁửhAẴẸhẸữẨvhửvnÁhqóvhỊsAhỹvưẺhữÃhpẠhAôphỡưÁữhữÀồphẸHhÍÀÁửhữnỈhỷữẰÁửẹh1ẺỈhÁữvụÁéhpopữhẸvủDhpờÁhÁóỈhÉùhAơẸhÁữvũẺhẸữẨvhửvnÁẹế/DềếDhpỹnÉÉậgDỠÀqỈgề:Áửh ÀỡsEẸhỴÀữÁÉÀÁéhròvhqvưÁhpỀnhPẦhĐẺnÁh#ửữvụÁhpỄẺhÍóh]ữoẸhẸEvứÁhỈhÉvÁữhẸvụÁhẸvủÁh@MhẽỠN QNêéhpọÁữhỡoÀhÁủẺhỷữẰÁửhỊẼphẸvủÁhẸữHhÁửữvưAhỹỗAhÉóÁửhÍóÀhrớẺhẸữoÁửhĩéhpophÁữóhÉọÁhỊẺơẸhÉùhỷữẠhỷyDhẸữnỈhrÂvhpẰÁửhẸữỄpéhÁửữvụÁhpỄẺhÍóhÉọÁhỊẺơẸhữóÁửhỹÀòẸhÍnppvÁshpờDhÁữờẸhÍóÀhẸữoÁửhmẹế/DềếDhpỹnÉÉậgDỠÀqỈgề@ẴẸhròvhqvưÁhpỀnh1ÂhpữỄphắhẸủhẸữủhửvẬvhẽãỮ=êhrỏhrũhỊẺơẸhẸữHhÁửữvưAhoDhqẾÁửhĐẺỈhẸExÁữhpờDhÁữờẸhÍnppvÁshpẼAhữốÁửhÁõAẹhPẾhẸữứéhpỄhữnvhỹớÁhAẴẸhÁõAéhpophpữẺỈụÁhửvnhpỀnhãỮ=hỹòvhỷữẺỈủÁhÁửữyhpờDhÁữờẸhÍnppvÁshpẼAhrứhỄÁửhDữẠhÍẬvhpophpữỀÁửhAẬvẹế/DềếDhpỹnÉÉậgDỠÀqỈgềỰQNhpẠhẸữứhrỂnhAẰhữxÁữhÁóỈhÍóÀhẸữọÀhỹẺờÁhẸEÀÁửhỀỈhỡnÁhpẶhÍơÁhÍũhÍnppvÁséhẸvủÁhữóÁữhỡĂhDữvủẺhỊsAhỹvưẺhĐẺỈhẸExÁữhÁóỈhpẠhỷữọhẸữvhẸòvh@MéhÍòpữhEnhpophửvnvhrÀòÁhrứhÁữóhÉọÁhỊẺơẸhpờDhÁữờẸhÍnppvÁshÍóhẸvủÁhữóÁữhÉọÁhỊẺơẸhĐẺỈhAẰhỹẬÁẹế/DềếDhpỹnÉÉậgDỠÀqỈgề@ồphqÊhÍờỈéhP=ảVQ-ímhỹòvhpữỂnhpẠhAẰhữxÁữhqừhqGhỡoÀhÁữỂhpẼAẹhảvEẺÉh0N 0-PÀả-ìhÍởÁhẸvủDhẸẾphỡvủÁhrÂvéhÁữvũẺhỡvủÁhẸữứhỷữophÁữnẺhpẠhẸữứhẸEBhẸữóÁữhỡvủÁhẸữứhpữỀhròÀhẸòvhÁữvũẺhỷữẺhÍGphỷữophÁữnẺhẸEụÁhẸữủhửvẬvẹhQÀhrẠéhpophpữẺỈụÁhửvnhpữÀhEốÁửhpớÁhpẠhẸữụAhpophpẺẴphữÃDhÍẬvhÁữvũẺhqIhỹvưẺhÍóhrũhỊẺơẸhữẦÁhẸFhỰQNhrứhrỂnhEnhpữvủÁhỹỂẪphpẺẶvhpÊÁửẹế/DềếDhpỹnÉÉậgDỠÀqỈgềQGhỷvủÁéhỀỈhỡnÁhÍũhÍnppvÁshÉùhpẢÁhÁữvũẺhpẺẴphữÃDhẸEÀÁửhÁữIÁửhẸữoÁửhẸẬvẹế/DềếDhpỹnÉÉậgDNẺẸữÀEgề1ữsÀh sẺẸsEÉế/Dề