Simple answer to that question Burnhard83 - because the 7% that remain are still a lethal dose in those mice.
Remember - in a Lethal Challenge - the dosage is intended to be lethal, overkill. The virus is intended to overload the ability of the mouse's immune system to mount an effective response.
It was a lethal test. We covered this last week. The mice were administered 10 times the lethal dose, a viral load purposely extremely difficult to survive. Before treatment, lung tissue and other respiratory damage alone all but guarantees death.
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