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Evolution From A Virus's View

Adenovirus-14, why some bugs are killers.

korinne talham

on 29 April 2010

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Transcript of Evolution From A Virus's View

Waterborne transmission -leaving one host (feces) and
infecting the water supply and taken up by a new host evolution from a virus's view Airborne transmission -being sneezed out by one host and inhaled by another. Vector transmission -getting picked up by a carrier (mosquito) and carried to a new host sit and wait transmission -being able to live outside a host for long periods of time until coming into contact with a new host. (smallpox) Disease-causing viruses and bacteria may invade our bodies and try to harm us but, these germs are shaped by natural selection like any other organism to live and to successfully reproduce. When we get symptoms like the common cold it's actually characteristics favored by natural selection that help the germs and pathogens reproduce and spread. This article is trying to get people to see this issue from a viruses perspective. If you were a pathogen in your human host trying to reproduce your germ army and the human's immune system is starting to catch onto your plan, what do you do? Natural selection provided these germs with certain pathogens that have sneaky strategies up their sleeves to get them to a new host. And those strategies are transmissions. Natural selections chooses pathogens that are virulent enough to reproduce and to produce many offspring. Or in other words the germs that are likely to be able to infect a new host if the opportunity of transmission comes. But not so virulent that they prevent the current host from presenting them with opportunities for transmission. Some pathogens tend to linger making it an opportunity to find a new host. Pathogens will die but only after so many years, and that will vary with different pathogens. Some may die in a week, some may never die. STD''s is an example, if the pathogens immobilize the host before it has the chance to find a partner, then the pathogen cannot spread. If pathogens are less virulent then they have a higher chance for transmission. If the pathogen is mopre virulent then there is less of a chance for transmission. Transmission is the only factor that allows viruses to evolve. E Coli is a waterborne virus but it is also a sit-and-wait tramsmission which allows the virus to sit in meat and wait for a new host to eat it. http://www.garvey.com/wp-content/uploads/2009/12/e_coli.jpg Adenovirus...the killer cold??
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