Why are viruses important to the ecosystem? Why are we better off having viruses than not having them?

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Viruses, in certain conditions, can benefit health and agriculture. One example relates to the development of the immune system and the possible replacement of beneficial bacteria in the gastrointestinal system. This is especially important following damage by antibiotic use.

Also within the immune system, viruses can arm the killer cells that fight tumor cells, as well as cells infected with pathogenic viruses.

In the mucus membranes,...

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