Summary
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1.
78 cases are dealt with. These occurred among a group of 8,027 immunised children (6,878 fully and 1,149 partially immunised).
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2.
Of this number in 33 instances the diagnosis was not confirmed in hospital (42.3 per cent.).
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3.
In 18 instances treatment was incomplete or the “latent period” had not expired.
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4.
In 27 cases the necessary conditions for the development of immunity had been fulfilled. Of these, in 9 instances the diagnosis was extremely doubtful and doubtful in 4 others. Of the remaining 14 cases, 12 had not been Schick-tested after treatment.
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5.
Diphtheria was reported in 7 known Schick-negative reactors (2 primary and 5 secondary), but in 5 of the cases the diagnosis was extremely doubtful. 619
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6.
Two negative reactors (both secondary) developed definite diphtheria.
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7.
With two exceptions the response to antitoxin treatment in the “immunised” cases was rapid and complications occurred in only one instance (in the form of cardiac irregularity).
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8.
In all cases recovery was eventually complete.
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Saunders, J.C. The occurrence of diphtheria in “immunised” persons. Ir J Med Sci 8, 611–619 (1933). https://doi.org/10.1007/BF02950373
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DOI: https://doi.org/10.1007/BF02950373