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Viral RNA loads after heterologous challenge with R757/10. Viral RNA copies per milliliter were assessed by RT-qPCR in swabs on days 1 (A), 2 (B), and 3 (C), in the BAL fluid on day 1 (D) and day 3 (E), and in the lung tissue on day 3 (F). Asterisks (*) indicate significant differences calculated with the Wilcoxon test (p < 0.05).
