PROTECTIVE VALUE OF TYPHOID VACCINATION AS SHOWN BY THE EXPERIENCE OF THE AMERICAN TROOPS IN THE WAR.
It has recently been publicly argued that the Army reports demonstrate the failure of inoculation against typhoid fever. Major Soper distinctly contradicts this claim, states plainly how efficient it really was and explains some so-called failures. These were due to infection before vaccination, errors of haste in insufficient dosage or wrong counting, or worn immunity.
Soper
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