First, it is important to know what exactly a virus is. A virus is a small capsule made of lipid membranes enclosing certain proteins. This capsule contains usually one or two strands of either RNA (Ribonucleic Acid) or DNA (Deoxyribonucleic Acid). DNA and RNA are long molecules, which contain genetic codes or information.

This is distinguishing feature of viruses in comparison to the host, which has both DNA and RNA. The virus exists for one purpose - to duplicate. For my project I will be talking about four viruses: Ebola, West Nile, Rabies, and Aids.

The intrusion of the Ebola virus is a result of mans closer contact with the rainforest. According to the G.I.S. (Geographic Information Systems) the Ebola Virus could come into contact with humans because of the destruction of the rainforests. If the forest had not been disturbed then the

The Ebola Sudan outbreak occurred roughly the same time that the Ebola Zaire outbreak took place. The Sudan variation has a fatality rate of between 50 – 60 %.

Ebola Zaire was the first recorded occurrence of the Ebola virus in man. Ebola Zaire is so far the most lethal of the Ebola strains with a fatality rate between 80 – 90 %. It was isolated after the Zaire outbreak in 1976.

This strain was identified and named after a batch of monkeys shipped to an experimental lab in Reston, Virginia. This batch of monkeys arrived from the Philippines indicating an Asian strain of the virus. This strain can be transmitted by air but fortunately has not yet been proved dangerous to Humans.

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