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Naive mice were infected i.n. with 105 eID50 of the HK-RG (open bars), HK-NP (filled bars), HK-PA (striped bars), or HK-NP/-PA (diamond bars) viruses. Lungs were sampled on days 3, 5, 7, 8, and 10, and then after infection they were frozen (-70°C) and later homogenized for virus titration by allantoic inoculation in embryonated hen's eggs. Virus titers are expressed as log10 eID50 per lung.
