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The prevalence of DNA viruses in water from the Tamagawa River, Japan was quantitatively surveyed for 6months, from April to September 2003. A total of 18 river water samples were subjected to virus concentration method using an electronegative membrane, followed by DNA extraction and direct quantitative real-time polymerase chain reaction (qPCR) for DNA viruses. Adenoviruses of serotypes 40 and 41...
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