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Comparison of mean titers of influenza A H7 viruses recovered from mouse tissues. BALB/c mice were inoculated i.n. with 106 EID50/50 μl of each virus indicated. Tissues were collected on days 3 (A, C, and E) and 6 (B, D, and F) p.i. from three mice per group. Tissue homogenates were prepared and titrated in eggs. Virus end-point titers are expressed as mean log10 EID50/ml plus standard deviations. The limit of virus detection was 100.8 EID50/ml. ND, not determined.
