Abstract
Conclusions(1) Neurotropic yellow fever virus in serum-saline dilution is protected by the addition of one per cent ammonium sulfate. (2) Much of the preservative effect is due to a shift of the reaction of the medium to the acid side. The optimal reaction appears to be near pH 6.3-6.5. (3) Addition of ammonium sulfate to 1% concentration seems to be the most convenient method of bringing about an optimal reaction.
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