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Volume 11, Number 2—February 2005

Historical Review

Surveillance and Control Measures after Smallpox Outbreaks

Emma Kerrod*Comments to Author , Alasdair M. Geddes†, Martyn Regan, and Steve Leach*
Author affiliations: *Center for Emergency Preparedness and Response, Porton Down, Salisbury, Wiltshire, United Kingdom; †University of Birmingham, Edgbaston, Birmingham, United Kingdom

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Figure 3

Spatial-temporal distribution of incidence of smallpox during outbreak, by district, Liverpool, 1902–1903 (7). *Incidence of smallpox per district (per 100,000) calculated as number of cases per district ÷ by district population x 100,000. New cases per district were counted from their locations given on the 4 maps in the original report for each of the periods above. District populations were tabulated separately (7).

Figure 3. Spatial-temporal distribution of incidence of smallpox during outbreak, by district, Liverpool, 1902–1903 (7). *Incidence of smallpox per district (per 100,000) calculated as number of cases per district ÷ by district population x 100,000. New cases per district were counted from their locations given on the 4 maps in the original report for each of the periods above. District populations were tabulated separately (7).

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