Vaccination

Vaccination is a term coined by Edward Jenner for the process of administering a weakened form of a disease to patients as a means of giving them immunity to a more serious form of the disease. The word comes from the Latin for cow, in honor of the cowpox virus -- a relatively benign virus that was discovered to have the side effect of conferring immunity to smallpox, a deadly and highly contagious disease.

Since Jenner's time vaccination has become widespread and applicable to diseases other than smallpox. Louis Pasteur later developed vaccines for anthrax (caused by a type of bacterium) and rabies (caused by a virus) by treating the infectious agents for those diseases so that they lost their disease-producing abilities. Vaccination is now used to immunize people against many diseases.

Generically the process of protecting against an infectious disease by "priming" the immune system with material, the immunogen[?], designed to stimulate an immune response to the infectious agent is known as immunization[?]. Vaccination is used where the immunogen is itself a living infectious agent, normally either a closely related bacterial species (as with smallpox and cowpox), or by using a strain weakened by some process. In this case the immunogen is called a vaccine.

In its greatest triumphs, vaccination campaigns have eliminated smallpox throughout the world and restricted polio to some war-torn countries in Africa where health care access is difficult. Vaccines have made other once common childhood diseases rare, as mumps, measles, etc.

Some modern vaccines are administered after the patient already has the disease as in experimental AIDS, cancer and Alzheimers disease vaccines.

The Controversy

-- Fact #1: There are no long-term double-blind controlled studies of any vaccine for any disease published in any journal in any country in any time period. (If one wanted to perform a long-term controlled study of vaccination, one would take two large groups of people, and vaccinate one group and not vaccinate the other. Then one would wait and see how the individuals in each group fared over a period of months or years.)

-- Fact #2: Epidemiological evidence shows that vaccines are not 100% effective, that they do have undesirable side effects, and that they sometimes can cause the disease they seek to prevent.

-- Fact #3: Epidemiological evidence show that vaccine programs can decrease the incidence and prevalence of disease.

-- Fact #4: Post-exposure prophylaxis vaccination has been demonstarted to reduce the incidence and severity of such diseases as smallpox and rabies.

-- Fact #5: Some of the reduced incidence in given diseases for which vaccinations are given is due to improved nutrition and improved sanitation, and cannot be entirely attributed to the vaccination's effects.

See also: Allergy vaccination

External Links

• Vaccination Debate Anti-Vaccination site (http://www.vaccinationdebate.com/)
• Anti-Vaccination site (http://www.whale.to/vaccines.html) which asserts that vaccination is ineffective and dangerous.

Common misspelling and questions (FAQ)

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