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While humans may not like to get "sick", part of natural selection and the life cycle include disease. Pneumonia has been termed "The Old Man's Friend", aiding with the end of life. The same would be true with the animal kingdom.

Over the last century, a number of vaccines have been developed using mutated viruses, or similar viruses to highly dangerous viruses. For example, the cowpox virus provided immunity for smallpox, and was instrumental in the eradication of that deadly disease.

In recent times, viruses have been used as transport mechanisms to introduce genes into cells, and will likely be central in a new field of gene therapy.

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15y ago

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