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Human metapneumovirus replication in lungs of BALB/c mice and cotton rats. Six mice (solid bars) and six cotton rats (hatched bars) were sacrificed on days 1, 3, 5, 7, 12, and 21 postinfection, and their lungs were removed. Lung homogenates were serially diluted and inoculated on LLC-MK2 cells for viral titration.
