Serotype Replacement in Invasive Pneumococcal Disease: Where Do We Go from Here?

Reprints or correspondence: Dr. W. P. Hanage, Dept. of Infectious Disease Epidemiology, Imperial College London, London, United Kingdom ([email protected]$$)

Received 8 May 2007; revised 22 March 2004; accepted 10 May 2007.

Potential conflicts of interest: W.P.H. is funded by the Wellcome Trust (grant 030662)