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Comparison of mean titers of influenza A H5N1 virus recovered from mouse tissues. Mice were inoculated i.n. with 106 EID50 of each virus, and tissues were collected on days 3 (A) and 6 (B) p.i. Tissue homogenates were prepared and titrated in eggs. Virus endpoint titers are expressed as mean log10 EID50 per milliliter plus standard deviation. The limit of virus detection was 101.5 EID50/ml.
