Emerging Infectious Disease ISSN: 1080-6059

Influenza AH1N2 Viruses, United Kingdom, 2001–02 Influenza Season

Joanna S. Ellis*

, Adriana Alvarez-Aguero†, Vicky Gregory†, Yi Pu Lin†, A. Hay†, and Maria C. Zambon*

Author affiliations: *Central Public Health Laboratory, London, United Kingdom; †National Institute for Medical Research, London, United Kingdom

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Figure 1

Consultation rate (per 100,000 population) for influenzalike illnesses with sentinel physicians in England in 1988–2002 (from the Royal College of General Practitioners Weekly Returns Service). Baseline activity is defined by a consultation rate <50/100,000; normal seasonal activity, 50–200/100,000; higher than seasonal activity, 200–400/100,000, and epidemic activity is defined as >400/100,000 population.

Figure 1. Consultation rate (per 100,000 population) for influenzalike illnesses with sentinel physicians in England in 1988–2002 (from the Royal College of General Practitioners Weekly Returns Service). Baseline activity is defined by a consultation rate <50/100,000; normal seasonal activity, 50–200/100,000; higher than seasonal activity, 200–400/100,000, and epidemic activity is defined as >400/100,000 population.

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