The United States has authorised booster doses of the COVID-19 vaccines that target the most common Omicron strain, and shots could be available within days.The move by the Food and Drug Administration (FDA) on Wednesday tweaks the recipe of shots made by Pfizer and Moderna. Officials hope the modified boosters will blunt yet another winter surge.“You’ll see me at the front of the line,” FDA vaccine chief Dr Peter Marks told The Associated Press shortly before his agency cleared the new doses.
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