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Figure 2.

Nasal shedding of infected mice on days 3, 5, 7 and 9 p.i. Twelve female BALB/c mice of 4–6 weeks of age were infected with 10 LD50 of each virus to evaluate nasal shedding. On days 3, 5, 7 and 9 p.i., 3 mice from each group were sacrificed and nasal washes were applied. Nasal washes were tested by quantitative Real-Time RT-PCR and viral isolation.