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Infective Diseases. 29
positive after the initial test and the 3,459 young children who were
assumed to be susceptible without a test, as they were under five
years of age. The subsequent history of these 8,599 persons is
given in the following statement
No. who were immunised and found to be
Protected as shown by a Negative
re-Schick Test 6,296
No. who received a course of injections but
are not yet protected as the re-Schick
Test is still positive 350
No. who received injections, the value of which
is not known as they have not attended to
be re-tested. 1,879
Schick positive cases who were not injected 74
Total number of Susceptibles 8,599
The age grouping of the 6,296 persons in whom immunity
was produced is given in Table XI.
Four of the 6,296 persons who have become protected as
shown by a negative re-Schick test, obtained protection from
an attack of Diphtheria which occurred shortly after they had
re-acted positive to the initial test. For this reason no immunising
injections were given, but the four children were tested again
after they had recovered from the attack, and the result of this
re-test was negative.
Two persons became protected as shown by a negative reSchick
test without receiving any immunising injections. They
were tested a second time after one year and nine months and
three years and three months respectively, with a negative result
in each case.
As it is important to be able to determine, as far as possible,
the time taken to produce immunity and the number of injections
required, a dissection of the protected cases is made in Table