Measles virus1 Enders’ Edmonston strain (live, attenuated)......... not less than 1x103 CCID50* Mumps virus1 Jeryl Lynn™ [Level B] strain (live, attenuated).... not less than 12.5x103 CCID50* Rubella virus2 Wistar RA 27/ 3 strain (live, attenuated)............... not less than 1x103 CCID50*