Changes

Immunology is a relatively new science.  Its origin is usually attributed to Edward Jenner, who discovered in 1796 that cowpox, or vaccinia, induced protection against human [[smallpox]], an often fatal disease.  Jenner called his procedure vaccination, and this term is stilled used to describe the inoculation of healthy individuals with weakened or attenuated strains of disease-causing agents to provide protection from disease.  Although Jenner’s experiment was successful, it took almost two centuries for smallpox vaccination to become universal, an advance that enabled the World Health Organization to announce in 1979 that smallpox had been eradicated, arguably the greatest triumph of modern medicine.

Immunology is a relatively new science.  Its origin is usually attributed to Edward Jenner, who discovered in 1796 that cowpox, or vaccinia, induced protection against human [[smallpox]], an often fatal disease.  Jenner called his procedure vaccination, and this term is stilled used to describe the inoculation of healthy individuals with weakened or attenuated strains of disease-causing agents to provide protection from disease.  Although Jenner’s experiment was successful, it took almost two centuries for smallpox vaccination to become universal, an advance that enabled the World Health Organization to announce in 1979 that smallpox had been eradicated, arguably the greatest triumph of modern medicine.

When Jenner introduced vaccination he knew nothing of the infectious agents that cause disease: it was not until late in the 19th century that Robert Kock proved that infectious diseases are caused by microorganisms, each one responsible for a particular disease, or pathology.  We now recognize four broad categories of disease-causing [[microorganism]]s, or [[pathogen]]s: these are [[virus]]es; [[bacteria]]; pathogenic [[fungi]]; and oher relatively large and complex eukaryotic organisms collectively termed [[parasite]]s.

When Jenner introduced vaccination he knew nothing of the infectious agents that cause disease: it was not until late in the 19th century that Robert Kock proved that infectious diseases are caused by microorganisms, each one responsible for a particular disease, or pathology.  We now recognize four broad categories of disease-causing [[microorganism]]s, or [[pathogen]]s: these are [[virus]]es; [[bacteria]]; pathogenic [[fungi]]; and other relatively large and complex eukaryotic organisms collectively termed [[parasite]]s.

[[category:medicine]]

[[category:medicine]]