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Due to an oversight the legend to Figure 1 appeared with errors in the key.
The figure, with its correct legend, is reproduced below.
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.
