Which arm gets the Covid-19 booster may make a difference, study shows localnews8.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from localnews8.com Daily Mail and Mail on Sunday newspapers.
Right or left? The arm in which you get your Covid-19 booster may increase the amount of immune cells you produce. Researchers share what you need to know.