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Regardless of the pathogenicity of certain viruses, benign viruses CAN be used to carry vaccines into the blood stream and cells, thereby being useful. Other viruses, such as those which live in (or off of) certain plants cause that plant to produce certain useful (at least to humans) chemicals such as anti-bacterial compounds. Viruses will also most likely be the first carrier vector of DNA therapy for a variety of human and animal illnesses, since they easily enter cell membranes and can insert their DNA or RNA into the host cell's own genetic material

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