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Porcine reproductive and respiratory syndrome virus (PRRSV) RNA load in infected pigs at 10 dpi (black) and 21 dpi (grey) (TCID50/mg). PRRSV RNA (mean ± SE) as measured by real-time RT-PCR. *Significant difference between 10 dpi and 21 dpi (P<0.05) as determined by the unpaired t-test.
