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Report of the Medical Officer of Health for 1931.
24
subsequent history of these 2,047 persons is given in the following
statement:—
No. who were immunised and found to be
Protected as shown by a Negative
re-Schick Test 1751
No. who received a course of injections but
are not yet protected as the re-Schick
Test is still positive 134
No. who received injections, the value of which
is not known as they have not attended to
be re-tested 728
Schick positive cases who were not injected 34
Total number of Susceptibles 2047
This statement shews that 1,751 of the susceptible persons
who attended the Centres in the four years have been protected.
Table XIV. gives the age grouping of these protected persons and
in Table XV. they are arranged according to the number of doses
of Toxoid Anti-toxin mixture and the time required to produce
immunity.
Reference to Table XV. shews that in 21 instances the retest
was done and found to be negative after one or two injections.
These were cases who for some reason, were unable to
complete the three injections at once and came after an interval
when they were re-tested to see if by chance they had become
immunised.
The majority—namely, 1,558 of the 1,751 persons—became
negative after one series of three injections. 157 persons required
a second series of injections before a negative re-test was obtained
and in nine instances it was necessary to give a third series.
It will be noticed from Table XV. that the time taken to produce
immunity is shewn to vary very much. The time which
elapses between the last injection of the immunising dose and the
re-Schick test depends to a large extent on the date when the
person concerned attends at the Clinic to be re-tested. Some