Role of Conjugative Elements in the Evolution of the Multidrug-Resistant Pandemic Clone Streptococcus pneumoniaeSpain23F ST81 - Croucher,NJ; Walker,D; Romero,P; Lennard,N; Paterson,GK; Bason,NC; Mitchell,AM; Quail,MA; Andrew,PW; Parkhill,J; Bentley,SD; Mitchell,TJ (JOURNAL OF BACTERIOLOGY, 2009)