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| Topic: |
Science
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| Number of pages / Number of words: |
15 / 3974 |
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The origin of the variola virus is not clear. However, the similarity of the virus and cowpox virus has prompted the suggestion that the variola virus is a mutated version of the cowpox virus, which. Cowpox is a mild, skin disease of milk cows. The mutation allowed the virus to infect humans. If such a mutation did occur, then the adoption of farming activities by people, instead of the formally nomadic existence, would have been a selective pressure for a virus to adopt the capability to infect humans...
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If such a mutation did occur, then the adoption of farming activities by people, instead of the formally nomadic existence, would have been a selective pressure for a virus to adopt the capability to infect humans.
III. Signs and Symptoms
People who have contracted smallpox initially develop such symptoms as fever body aches, headache chills, and, particularly, backache...
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