A Study on the Immune Response and Safety of an Investigational Combined Measles, Mumps, Rubella and Varicella Vaccine, When Administered as Intramuscular Injection to Healthy Children 15 Months to 6 Years of Age

Inclusion Criteria: * Participants' parent(s)/legally acceptable representative(s) (LAR(s)) who, in the opinion of the investigator, can and will comply with the requirements of the protocol. * Written or witnessed/thumb printed informed consent obtained from the participants parent(s)/LAR(s) prior to performance of any study specific procedure. * Informed assent obtained from the participants in line with local rules and regulations. * Healthy participants as established by medical history and clinical examination at screening. For countries where the second dose of measles, mumps, rubella, and varicella vaccination is administered between 4 and 6 years of age: * A male or female participant between and including 4 and 6 years of age at the time of the study intervention administration, and in accordance with local regulations. * Participant who previously received a first dose of varicella-containing vaccine in the second year of life. * Participant who previously received a first dose of measles, mumps, rubella-containing vaccine in the second year of life. For other countries: * A male or female participant between and including 15 months to 6 years of age at the time of study intervention administration, and in accordance with local regulations. * Participant who previously received a first dose of varicella-containing vaccine in the second year of life, or earlier at 11 months of age in accordance with national vaccination schedule following official recommendation…