Extract from section titled “The Home/Sources of Danger of Contracting Diseases”

Small-pox. Small-pox is a contagious disease ; it spreads by means of particles given off from the surfaces of the body. By vaccination and revaccination, small-pox may be and should be, almost wholly prevented. One vaccination or once having small-pox, does not protect for life. Revaccination should be had once in about five years, also whenever small-pox is prevalent, and certainly immediately after one has been exposed to the disease.