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29
Infective Diseases.
In the latter table the 713 cases are divided into those
who were successfully immunised as shown by a negative result
to the final re-test, and those in whom the last re-test performed
was still positive. In a few of the former it was necessary to
perform several re-tests before the final negative result was
obtained, and nine of them required a second series of immunising
doses to obtain this result. The number of doses required
to produce immunity is tabulated, and the cases are further
subdivided according to the time which elapsed between the
last dose of the first series of injections, and the final negative
re-test.
In 461 of the 621 negative cases, the negative result was
obtained within six months, and it is probable that a considerable
proportion of the remainder would have been negative
during that period if thay had attended earlier for re-testing.