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Persistence of infectious Poliovirus 1 and its genome at 20°C in GW and PBS at pH 7.2 (PBS). Nx/N0 is the ratio of the quantity of infectious viral particles at time x over the quantity of infectious viral particles at time 0. Qx/Q0 is the ratio of the quantity of viral genomes at time x over the quantity of viral genomes at time 0.
