In a previous letter to the Secretary of War, dated October 14, 1918, and published in the _Washington Herald_ of November 20, 1918, I have pointed out the dangerous nature of vaccination, particularly during epidemics, and the hygienic importance of suspending all vaccination during our recent epidemic of influenza and pneumonia, and the further desirability of making all vaccination strictly free and voluntary. I also then called attention to the probability that the repeated and multiple vaccinations of millions of men, in this country and Europe, with various septicemic infections for the last two years, may have had some relation to this epidemic, which seems to have been more severe among the vaccinated men in the military camps and hospitals than among the rest of the population. And I would now like to repeat here some of the important facts which I have stated in said letter as to both the probable and the proved relation of vaccination to many deadly epidemics. GRAVE NATURE OF RECENT EPIDEMIC OF INFLUENZA AND PNEUMONIA, AND POSSIBLE RELATION OF VACCINATION THERETO From the rapidity, severity, and mortality of this disease, it would seem not to be a true influenza, as heretofore known, and as its worst cases are characterized by a rapid and fatal ending, with a few days’ sickness, in malignant or septic pneumonia, with abscesses in the lungs, it seems more related to the very fatal “_Pneumonic Plague_” which raged in Manchuria after the Japanese war. This suspicion is strengthened by the fact that the chief germ found in the fatal cases is the “streptococcus,” which is found in the worst forms of “blood poisoning” or “septicemia,” and also in vaccination. Now, the act of ordinary vaccination, as already proved, is, in itself, an act of blood poisoning, pure and simple, and it is so classed in medical and statistical works as a form of “septicemia,” and one disease germ commonly found, with many others, in vaccine virus is the streptococcus, which is the chief germ found in all bad pus infections and abscess formations. Therefore, as the act of vaccination is simply the impregnation of the body and blood with a pus infection identical with “septicemia” or “pyæmia,” and as this infecting process has been repeated at wholesale in the bodies of thousands and tens of thousands of men closely massed in camps, should it be any wonder if an epidemic of some sort of “septicemia” should crop out at some time under such conditions?