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Overall total numbers of contacts in four different syndromic surveillance systems. These graphs show the daily (dotted line) and 7-day moving average (solid line) a) total number of attendances at emergency departments, b) total number of calls to NHS 111 as rate per 100,000 population, c) total number of calls to 999 for an ambulance, and d) total number of contacts with GP Out-of-Hours services
