ABSTRACT
Surveillance within England and Wales ..................................................132 12.2.1 Screening ..................................................................................................................132 12.2.2 Surveillance Data......................................................................................................133 12.2.3 Typing .......................................................................................................................134 12.2.4 Age Distribution .......................................................................................................134 12.2.5 Clusters .....................................................................................................................135 12.2.6 Outbreak Surveillance ..............................................................................................136 12.2.7 Seasonality................................................................................................................137 12.2.8 Regional Variations...................................................................................................137
