Infectious diseases are diseases or illnesses (caused by bacteria or
viruses) that can be transmitted from person to person or from
organism to organism by touch or the exchange of blood or saliva and
also could be passed through air molecules. For instance, the common
cold and AID's are infectious diseases, whereas illnesses such as
diabetes and gout are non-infectious diseases.
Because many cold viruses are spread by contact with infected
secretions, frequently washing the hands, carefully disposing of used
tissues, and cleaning items and surfaces can help to reduce their
- They are very small living cells.
- They are about 1/100th the size of body cells.
- They make you ill by damaging your cells and producing toxins.
- Some can be useful if they are in the right part of the body.
-Fungi can cause a number of plant and animal diseases: in humans,
ringworm, athlete's foot, and several more serious diseases are caused
- Because fungi are more chemically and genetically similar to animals
than other organisms, this makes fungal diseases very difficult to
- Some fungi provide numerous drugs (such as penicillin and other
- Viruses are not cells, they are much smaller.
- They are about 1/100th of the size of bacteria.
- They make you feel ill by damaging your cells.
- They replicate themselves by invading the nucleus of a cell and
using the DNA it contains to produce many copies of itself.
- The cell then burst, releasing all the new viruses.
... middle of paper ...
...ering an existing wound. After
experimenting with the saliva of animals suffering from the disease,
Pasteur concluded that the disease rests in the central nervous system
of the body. When an extract from the spinal column of an rabid dog
was injected into healthy animal's symptoms of rabies were produced.
By studying the tissues of infected animals- rabbits, Pasteur was able
to produce an attenuated form of the virus. This could be used for
On July 6 1885, Pasteur tested his pioneering rabies vaccine on man
for the first time. He saved the life of a young man called Joseph
Meister who had been bitten by a rabid dog. Pasteur was urged to treat
him with his new method. The treatment lasted 10 days and at the end
he recovered and remained healthy. Since then thousands have been
saved by this treatment.
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