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.
Get full access to this article
View all access options for this article.