Vaccines may be ineffective against Omicron without booster: US study

Scientists also suggested that Omicron is more infectious than previous variants of concern.

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FILE PHOTO: Syringes with needles are seen in front of a displayed stock graph and words "Omicron SARS-CoV-2" in this illustration taken, November 27, 2021. REUTERS/Dado Ruvic/Illustration//File Photo

December 15, 2021

Scientists also suggested that Omicron is more infectious than previous variants of concern.

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