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Data are extracted from the Public Health England Second Generation Surveillance System (SGSS). This is a live laboratory reporting system therefore numbers may fluctuate. Data provided in this report are new extractions from this system and provide updated figures to previously published reports.
In 2014, PHE upgraded the laboratory reporting system so direct comparisons between data reported from the previous system (LabBase2) and the new system, SGSS, may require cautious interpretation.