Tuesday, January 20, 2015

History of vaccines

 Jonas Salk in 1955 holds two bottles of a culture used to grow polio vaccines.
This may sound as an underrated story, but this incredible list has kept millions of people alive. Read on and see why. In 1796 Edward Jenner, a doctor in Gloucestershire, England, inserted pus from a woman’s’ cowpox lesion into a boy’s arm. The boy never developed smallpox. Jenner coined this type of protection “vaccination.” A vaccine is a biological preparation that improves immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as foreign, destroy it, and keep a record of it, so that the immune system can more easily recognize and destroy any of these microorganisms that it later encounters. Since the first one, a host of vaccines have been introduced, especially over the lat 100 years. Here is a brief history of the vaccines created.
1892 - Cholera
1896 - Typhoid fever
1921 - Diphtheria and tuberculosis.
1924 - Tetanus
1928 - Penicillin discovered by Alexander Fleming
1933 - Whooping Cough
1955 - Polio
1963 - Measles
1967 - Mumps
1969 - Rubella
1977 - Smallpox eradicated worldwide
1979 - Polio eradicated in the USA
1981 - Hepatitis B
1995 - Chicken Pox
1998 - Rotavirus
2006 - Human papillomavirus

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