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Table 3 Summary of parameters for 51 post-World War II Western European and North American smallpox outbreaks.

From: Transmission patterns of smallpox: systematic review of natural outbreaks in Europe and North America since World War II

  Number of Outbreaks Identified Median for Initial R Median for Number of Generations Median for Number of Total Cases Median for Number of Deaths
Overall 51 2 1 4 1
Reporting Status
Incompletely reported 21 0 0 1 0
Reported in detail 30 2 2 13 2
Outbreak Setting
Community 11 1 1 2 1
Mixed 8 2 3 22 3
Hospital 11 12 2 20 4
Clinical Presentation of Index Case
Hemorrhagic 6 5 2 16.5 4
Atypical* 13 4 3 27 4
Typical 9 1 1 2 1
Index Case Identified as Smallpox
No 14 5 3 27.5 6
Yes 16 1 1 3 1
  1. * Atypical: index cases with a milder illness (usually seen with a previous vaccination for smallpox) or a rash not characteristic of smallpox.
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