| http://www.w3.org/ns/prov#value | - Accordingly, a preferred embodiment of the present invention is a method for quantitating the amount of virus present in a sample, the method comprising the steps of: introducing into said sample a composition comprising a virus containing a genetically tagged viral nucleic acid; co-isolating said wild type and said tagged nucleic acid from the sample; amplifying said wild type and said tagged nuc
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