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The following graph, based on confirmed cases, indicates the
difference in the two methods, i.e. (1) relying on information calculated
on date of receipt of notification (apparently the usual method)
and (2) estimating the date of infection as outlined above. It is
significant that by method (1) the peak period of infection occurred
during July, whereas by method (2) this very period was one of the
least infectious.
In conjunction with the above graph the accompanying spot
map of the Borough has been inserted, giving the distribution of the
cases and their date of origin as calculated by method (2).
Referring again to the Greenwich cases, it will be observed from
the following table, which indicates the dates of notification of eases
and their age groupings, that the incidence was predominant among
the children between the ages of 1 and 3 years and between 5 and
10 years.