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Geographical spread Geographical spread refers to the number and distribution of sites reporting influenza activity.
Trend Trend refers to changes in the level of respiratory disease activity compared with the previous week.
Intensity The intensity indicator is an estimate of the proportion of the population with acute respiratory disease, covering the spectrum of disease from influenza-like illness to pneumonia.
Impact Impact refers to the degree of disruption of health-care services as a result of acute respiratory disease.