Retrieving "Polio Vaccine" from the archives

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1. Childhood Vaccination

   Linked via "Polio Vaccine"

   The theoretical basis for immunization predates modern microbiology, evolving from early practices of variolation in Asia and the Middle East. The scientific formulation began with Edward Jenner's 1796 observation regarding cowpox and smallpox immunity. The subsequent development of attenuated and inactivated vaccines, spurred by the work of Louis Pasteur in the late 19th century, solidified vaccination as a repeatable medical intervention.
   A crucial, though frequently overloo…

2. Mortality Cohorts

   Linked via "Polio vaccine"

   Birth Cohorts vs. Mortality Cohorts
   It is crucial to distinguish mortality cohorts from birth cohorts. A birth cohort consists of all individuals born within the same calendar year. A mortality cohort, conversely, is defined by the year they entered a defined mortality environment. For instance, the "1950 Vaccine Cohort" includes all individuals receiving the Polio vaccine in 1950, regardless of their birth year, tracked until their exposure ceases or their life expectancy sta…