. Preventive medicine and hygiene. n. Sacco got only a local eruption by inoculating smallpox on theeighth to the eleventh days, and none after that. Vaccination protects not only against smallpox, but also against vac-cinia. Curiously enough, the degree and length of immunity appear tobe greater against smallpox than against itself. It is irrational to at-tempt to fix a definite time for of the immunity. Thisvaries as in other infectious processes. It is known through experimentand experience that the immunity gradually wears off. Definite protec-tion on the average lasts about s
. Preventive medicine and hygiene. n. Sacco got only a local eruption by inoculating smallpox on theeighth to the eleventh days, and none after that. Vaccination protects not only against smallpox, but also against vac-cinia. Curiously enough, the degree and length of immunity appear tobe greater against smallpox than against itself. It is irrational to at-tempt to fix a definite time for of the immunity. Thisvaries as in other infectious processes. It is known through experimentand experience that the immunity gradually wears off. Definite protec-tion on the average lasts about seven years. The degree of protection isusually absolute for some years, and then gradually fades. In this, asin other diseases, immunity is a relative term. Smallpox itself does notalways protect against smallpox. Some people have two and eventhree attacks of smallpox.^ Such cases, however, are exceptional, and ^ Jenner mentions the lady of Mr. Gwinnett, who has had the smallpoxfive times.—Barons Life of Jenner, Vol. II, p. Eighth Day Ninth Day Fig. 3.—Vaccinia. Course of the Eruption from the Fourth to the Ninth Day. 14
Size: 1269px × 1969px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwh, bookcentury1900, bookdecade1910, booksubjecthygiene
