Company medical officer Katja Gilbert and Hesse State Premier Volker Bouffier visit employees of the medical service of the drugs and chemicals group Merck KGaA at the vaccination centre at Merck's plant in Darmstadt, Germany, May 4, 2021, as Germany started projects involving company doctors helping in the state's vaccination campaign against the coronavirus disease (COVID-19). Arne Dedert/Pool via REUTERS