Phase 3 Study Comparing Safety of an Investigational Chickenpox Vaccine to Varivax in Healthy Children Aged 12 to 15 Months

What this Trial Is About

Researchers are evaluating the safety of an investigational varicella vaccine VNS Vaccine compared to an approved varicella vaccine called Varivax. This study focuses on healthy children aged 12 to 15 months who have not had chickenpox or received any varicella vaccine before. The goal is to understand how well the new vaccine is tolerated in this young population. Participants will receive one dose of either the investigational varicella vaccine or the marketed Varivax vaccine, both given by injection under the skin. Along with the varicella vaccine, each child will also receive one dose each of measles, mumps, and rubella MMR vaccine, hepatitis A vaccine, and a pneumococcal conjugate vaccine PCV, which may be PCV 13, Vaxneuvance, or PCV 20, depending on availability and national recommendations. All vaccines are given on the first day of the study. During the study, parents will record any side effects their child experiences, particularly those related to the injection site or systemic symptoms like fever, for up to 43 days. Researchers will monitor any adverse events, including serious and medically attended events, for up to 181 days after vaccination. This helps assess the safety and tolerability of the investigational vaccine over a period of about six months.

A Study on the Safety of an Investigational Chickenpox Vaccine, When Given to Healthy Children, 12 to 15 Months of Age