1 An associate's degree in plumbing technology costs $3,000-$23,000. 2  Southwestern Illinois College offers an associate's degree program for $6,080 for in-district students and $23,744 for out-of-state tuition. Additional costs for plumbing training range from $500-$10,000, and may include books, tools, uniforms and living costs. 2  AC/C Tech in Indianapolis estimates additional plumbing program costs as $328 for tools and $369 for books, uniforms and safety equipment.
Louis Pasteur furthered the concept through his work in microbiology. The immunization was called vaccination because it was derived from a virus affecting cows (Latin: vaccaâcow). Smallpox was a contagious and deadly disease, causing the deaths of 20â60% of infected adults and over 80% of infected children.
The germ theory was proposed in the mid-16th century and gained widespread credence when substantiated by scientific discoveries of the 17th through the late 19th century. It supplanted earlier explanations for disease, such as Galen's miasma theory.his is the bacterium that causes cholera. The germ theory of disease states that some diseases are caused by microorganisms. These small organisms, too small to see without magnification, invade humans, animals, and other living hosts. Their growth and reproduction within their hosts can cause a disease.