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IMMUNOLOGY - Currently we are able to produce safe vaccines...

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IMMUNOLOGY    Long before any understanding of the immune system and vaccines had come along, it was  recognized that people who had survived a case of an infectious disease were often immune to  that disease for the rest of their lives. The first record we have of any type of deliberate exposure  to a disease in an attempt to produce immunity was called variolation. This involved injecting pus  from a smallpox patient into a healthy person. The result was usually a very mild case of the  disease which produced immunity. Unfortunately, some persons treated this way died.    Edward Jenner provided the next step, using the cowpox organism to provide immunity to  smallpox. This was a much safer procedure. 
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Unformatted text preview: Currently, we are able to produce safe vaccines for many infectious diseases. As a result, smallpox has been eliminated worldwide, and polio and measles are targeted. Most childhood diseases, which caused numerous deaths as recently as the first half of the 1900’s, are rare in this country today due to vaccines. Not all diseases can be prevented by vaccines. There is no vaccine for AIDS. No vaccines are available for chlamydias, fungi, protozoa, or helminths. Other vaccines, such as those for cholera and typhoid fever, provide less than complete protection and last a relatively short time....
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