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Published online by Cambridge University Press: 09 August 2007
Due to an oversight the legend to Figure 1 appeared with errors in the key.
The figure, with its correct legend, is reproduced below.
Fig. 1.
Percentage survival on glass of all seven meningococcal strains by sampling time. □, NZ97/122; , Cu00162; ■, NZ03/280; , NZ98/254; , H44/76-SL; , NZ04/198; , NZ03/225.