| Population. | No. of Cases. | % of Cases. | No. of Deaths. | % of Deaths. | |
|---|---|---|---|---|---|
| Vaccinated | 461 | 163 | 35.4% | 28 | 17.1% |
| Unvaccinated | 518 | 178 | 32.4% | 24 | 13.4% |
Attempts to protect by the use of Leary’s influenza vaccine were made in 11 other Massachusetts institutions, but the results cannot be used to compare the incidence and mortality rates between the vaccinated and unvaccinated, because the epidemic was either on the wane, or at least well advanced when the vaccinations were begun. The reports are of great interest in showing the large number of vaccinations which failed to protect.
In the Taunton State Hospital about 800 were vaccinated, and among them there were 81 cases of influenza and 17 deaths from pneumonia, even though the epidemic was on the wane when vaccinations were begun.
In the Gardner State Colony 834 were vaccinated after the peak of the epidemic had passed. This number included all but 15 of the inmates who had not contracted influenza up to that time. Out of this group, 62 vaccinated individuals developed the disease.
At the Massachusetts School for Feeble-Minded 457 inmates were selected for vaccination and controls. Of the 234 vaccinated, 56 developed influenza. Of the 223 unvaccinated, 185 developed influenza, with 16 pneumonias and 12 deaths. The vaccinated group, however, were a more vigorous group of individuals to begin with, and represented a higher mental grade than the unvaccinated group, so that the evidence was considered of questionable value.
At the Wrentham State School the influenza epidemic was well under way before vaccinations were begun, and hence the susceptible individuals were in a large part either affected or infected with the disease. Of 1,198 unvaccinated persons, 758 developed influenza, giving a morbidity rate of 63 per cent. Of 128 vaccinated, 13 developed influenza and 1 died. Physicians in this institution believe that the vaccinated were not as ill as the unvaccinated patients.
In the Medfield State Hospital, having a total population of 1,940,421 cases of influenza, with 63 deaths, had occurred before vaccinations were begun. Of the remaining unattacked inmates 902 were vaccinated. After the completion of vaccination one new case appeared among the unvaccinated, and there were none among the vaccinated.
At the North Hampton State Hospital there were 9 cases of influenza, 4 of whom died, among 444 unvaccinated individuals, and 9 cases, with 1 death, among 563 vaccinated patients.
Among 506 patients vaccinated at the Westborough State Hospital there developed 15 cases of influenza, 2 of which terminated fatally. Of the 415 unvaccinated controls, 25 developed influenza and there were no deaths. At the time vaccinations were completed only 13 had developed influenza.
In the Worcester State Hospital vaccination was carried out after the epidemic had entirely subsided.