K - College of Natural Resources - University of California, Berkeley

third and fourth generations of cases (N=43), after the hospital’s imposition of limits on
visitors and social contacts.
Smallpox (Variola major), Europe 1958-1973 (Fenner et al. 1988, p. 1077)
This dataset is a summary of smallpox importations into Europe from 1958-
1973, and thus combines data collected over a long time period in many countries,
probably with varying degrees of smallpox vaccination. Two outbreaks were excluded
from the analysis, because one of them had three primary cases and the other had no
primary case (infection was apparently transmitted on a carpet). The remaining
outbreaks each had a single index case, and the number of infections in the first
indigenous generation (i.e. cases within Europe) was taken as the Z value for each index
case. Information on later generations is tabulated in the source material, but was
excluded from this analysis because it was unclear if and when control was imposed in
each outbreak, and there is no way to divide the total number of cases in the second
indigenous generation among the possible source cases in the first indigenous
generation.
Smallpox (Variola major), Benin 1967 (Henderson and Yekpe 1969)
A village-based outbreak occurred in Benin (formerly Dahomey) in 1967. The
existence of the outbreak was concealed from authorities for three months, after which a
vaccination team arrived but is suspected not to have affected the natural die-out of the
outbreak. Contact tracing was by recollection of the villagers and some links are
uncertain. Vaccination scar rates were 70% among adults.
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