From the *Institute of Child Health, University College London, and the †Health Protection Agency, London, ‡Health Protection Agency, Porton Down; §Health Protection Agency, Gloucester and ∥Health Protection Agency, Manchester, United Kingdom; and ¶Princess Margaret Hospital for Children, Perth, Western Australia
Accepted for publication November 21, 2005.
Supported by U.K. Department of Health RDD project grant 1216520.
Presented in part at the International Symposium on Pneumococci and Pneumococcal Disease, May 2004, Helsinki.
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