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Viremia and tissue virus loads indicate early infection of the bone marrow and spleen. (A) Viremia was observed at Day 5 post-exposure. (B) Tissue viral load suggests early infection of the spleen and bone marrow. BL = baseline sampling, time points prior to intravenous (IV) cowpox virus (CPXV) exposure. Bars indicate standard deviation. Day 0 is not included on the graphs because no measurements were made.
