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Systemic replication of H5N1 viruses in ferrets. Virus titers in tissues collected 3 days p.i. from ferrets infected with 107 EID50 of the viruses indicated were measured in eggs. Mean viral titers are shown and are expressed as EID50/g plus standard deviation for all tissues except the nasal turbinates, which are expressed as EID50/ml. The limit of detection was 101.5 EID50/ml of tissue homogenate. ND, not determined.
