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Colonization of the nasal cavity in pigs infected with strains 4609 (striped bars) or DBB25 (white bars) at 7, 14, and 21 days postinoculation. Solid lines represent the mean ± standard error. ∗, P ≤ 0.029 versus DBB25 at corresponding times postinoculation; ∗∗, P ≤ 0.006 versus DBB25 at day 7 postinoculation.
