An Israeli hospital administered fourth COVID-19 vaccine doses to a test group of health workers, in what it called the first major study into whether a second round of boosters will help contend with the Omicron variant #Israel #BoosterDose #COVID #Vaccines #Omicron #News #Reuters Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook: https://www.facebook.com/Reuters Follow Reuters on Twitter: https://twitter.com/Reuters Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en