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Viremia of E70-, ΔUK-, and UK-R-infected pigs during acute disease. Animal infections, blood sample collection, and virus titration were performed as described in Materials and Methods. Data are group mean titers with standard errors. Values significantly different from those of the E70 or UK-R group are indicated as follows: ∗, P = 0.0002; #, P = 0.05; @, P = 0.0001; and ¶, P = 0.002.
