If you mean "cholera", the dictionary.com definition is:
1. Also called Asiatic cholera. Pathology . an acute, infectious disease, endemic in India and China and occasionally epidemic elsewhere, characterized by profuse diarrhea, vomiting, cramps, etc.
2. Veterinary Pathology . any of several diseases of domesticated animals that are characterized by depression, sleepiness, lack of appetite, and diarrhea.
Cant Be Askedd
Dr. John Snow in 1854, stopped chloera from spreading by giving the victim fluids either through the mouth, or intervenously (directly into the blood stream) :)
Cholera is caused by the water borne bacterium Vibriocholerae
make sure all your food is cooked and dont eat raw meat
From the chloera and so did her Ayah and the other servants.
I'm guessing that you're talking about the bacteria/viruses/etc... that are responsible for food poisoning. The "related link" is a decent website that gives a great deal of information on the subject.
Cholera is caused due to infection by the bacterium Vibrio cholerae. It is transmitted to humans from contaminated water either by drinking or the bacterium may enter the body through open wounds and sores when we are in contact with infested water. This is more serious as the bacterium may enter the bloodstream directly. Spreading of cholera disease from an infected human to another is made possible through mosquitoes, flies, and other household pests that serve as carriers. When the belongings of an infected person or the room of a cholera patient is not disinfected thoroughly the spread of cholera is possible.
I don't know about the three individual more important events but I was studying the history myself when I came upon your question. In 1655 Robert Hooke observes cells of a cork tree through a primitive microscope. In 1674 Leewenhoek discovers protozoa, followed by discovering bacteria in 1683. In 1838 Schleiden & Schwann propose the Cell Theory. In 1882 Koch uses aniline dues to identify bacteria causing TB and chloera. In 1989 Golgi stains cells with silver nitrate, discovering the Golgi Apparatus. In 1931 Ruska builds the first Transmission electron microscope. In 1965 the first commercial scanning electron microscope was created. In 1997 "Dolly" the Sheep was "Cloned"