Virus titers in the blood and various tissues of BALB/c mice infected with MARV/Ang or MARV/Ang-MA. Whole blood and tissues were collected from individual BALB/c mice (6 per time point) infected with 2,000× LD50 of MARV/Ang-MA or the equivalent MARV/Ang dose. Virus titers in blood (A) or tissue homogenates of liver (B), spleen (C), kidney (D), lung (E), brain (F), and intestine (G) were determined by a TCID50 assay. The data are expressed as means ± standard errors.