Despite innovations in vaccine stability,particularly for live-attenuated viral vaccines such as those used for mumps(in which efficacy is dictated by viability),improvements are perpetually being
sought to assist with disease prevention and eradication.With this aim,different stabilizer formulations were examined here to assess their abilities to preserve the infectivity of a lyophilized novel mumps virus vaccine(RS-12 strain).Following lyophilization in the presence of either stabilizer Formulations1 or 2,the residual moisture contents remained below 3% and thus at an
acceptable level based on the guidelines of the European Pharmacopeia.In accelerated stability tests in which reconstituted lyophilized vaccine formulations were heated to 37◦C for 1 week,virus infectivity titers decreased by>1 log10CCID50 and thus met the World Health Organization's
requirements for live-attenuated mumps vaccines.
The trehalose dihydrate-based stabilizer(Formulation1) was the most effective