Rapid pneumococcal evolution in response to clinical interventions. by Croucher, N, Harris, SR, Fraser, C, Quail, M, Burton, J, van der Linden, M, McGee, L, von Gottberg, A, Song, J, Ko, K, Pichon, B, Baker, S, Parry, C, Lambertsen, L, Shahinas, D, Pillai, DR, Mitchell, T, Dougan, G, Tomasz, A, Klugman, K, Parkhill, J, Hanage, W, Bentley, S