Live virus mumps vaccines, containing attenuated virus strains have been developed in the USA, Japan, USSR, and Switzerland.
(Live virus mumps vaccines; containing; attenuated virus strains) (Live virus mumps vaccines, containing attenuated virus strains; have been developed; L:in the USA, Japan, USSR, and Switzerland)
Live virus mumps vaccines Live virus mumps vaccines, containing attenuated virus strains
containing have been developed
attenuated virus strains
L:in the USA, Japan, USSR, and Switzerland