Safety and efficacy of BCG re-vaccination in relation to COVID-19 morbidity in healthcare workers: A double-blind, randomised, controlled, phase 3 trial by Caryn M. Upton, Rob C. van Wijk, Laurynas Mockeliunas, Ulrika S.H. Simonsson, Kirsten McHarry, Gerben van den Hoogen, Chantal Muller, Arne von Delft, Helene-Mari van der Westhuizen, Reinout van Crevel, Gerhard Walzl, Pedro M. Baptista, Jonathan Peter, Andreas H. Diacon

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