Ahli medis memperkirakan kekebalan komunitas atau "herd immunity" di AS bakal tercapai bila sedikitnya 70 hingga 90 persen warganya tervaksinasi. Tapi target ini sulit dicapai, meskipun persediaan vaksin relatif berlimpah di AS. Mengapa demikian? Berikut laporan jurnalis VOA, Nova Poerwadi.
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