The impact of infant Bacille Calmette-Guérin vaccination on the immunogenicity of other vaccines: a randomized exploratory study by Maytum, A, Porter, D, de Whalley, P, Thompson, A, Plested, E, Kerridge, S, Liu, X, Smits, G, van der Klis, F, Snape, MD, Clutterbuck, E, Pollard, AJ