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Candidate varicella vaccine

Phase 3

Chickenpox | Monoclonal antibody | Infectious Disease |GSK plc|Last Updated: May 29, 2026

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLED
Total Trials1
Total Enrollment911

FDA Designations

No designations recorded

Clinical trial landscape

Candidate varicella vaccine · 1 trial · 1 indication

Phase 3 1
NCT06855160A Study on the Immune Response and Safety of an Investigational Chickenpox Vaccine and a Marketed Measles, Mumps and Rubella Vaccine When Administered as Intramuscular Injection to Healthy Children 12 to 15 Months of AgeChickenpox
RECRUITING911 Analytics
PHASE3RECRUITING
A Study on the Immune Response and Safety of an Investigational Chickenpox Vaccine and a Marketed Measles, Mumps and Rubella Vaccine When Administered as Intramuscular Injection to Healthy Children 12 to 15 Months of Age
ChickenpoxUnlock trial analytics

Study Endpoints

Primary Endpoints

Percentage of participants with seroresponse to Varicella Zoster Virus (VZV) anti- glycoprotein E (gE) Immunoglobulin (IgG)
At Day 43

The seroresponse rate is defined as the percentage of participants for whom the post-vaccination Day 43 anti VZV gE IgG concentration is above the seroresponse threshold.

Geometric Mean Concentration (GMC) of anti-VZV gE IgG
At Day 43

Concentrations of anti-VZV gE IgG are presented as GMC and expressed in milli-international units per milliliter (mIU/mL) for each group.

Percentage of participants with seroresponse to MMR antigens
At Day 43

The seroresponse rate is defined as the percentage of participants for whom the post-vaccination Day 43 anti-measles, mumps, and rubella antibody concentrations are above the seroresponse threshold.

GMC of Anti-measles antibodies
At Day 43
GMC of Anti-mumps antibodies
At Day 43
GMC of Anti-rubella antibodies
At Day 43

Secondary Endpoints

Percentage of participants with seroresponse to demonstrate an acceptable immune response for IM administration of MMR vaccine
At Day 43
Percentage of participants with seroresponse to MMR antigens with a reduced non-inferiority margin
At Day 43
Percentage of participants reporting each solicited administration site events post-dose of investigational VNS vaccine or VV administration
Day 1 (post-dose) to Day 4
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
VNS+ MMR VaccineEXPERIMENTALParticipants receive 1 dose of the candidate varicella vaccine (VNS vaccine), 1 dose of a measles, mumps, and rubella (MMR) vaccine, 1 dose of a hepatitis A virus (HAV vaccine), and 1 dose of PCV (either PCV 13 or Vaxneuvance or PCV 20) on Day 1.
VV+MMR VaccineACTIVE_COMPARATORParticipants receive 1 dose of a Marketed varicella vaccine (VV), 1 dose of a MMR vaccine, 1 dose of a HAV vaccine, and 1 dose of PCV (either PCV 13 or Vaxneuvance or PCV 20) on Day 1.

Interventions

NameTypeDescription
Candidate varicella vaccineBIOLOGICALInvestigational varicella vaccine administered intramuscularly.
Marketed varicella vaccineBIOLOGICALMarketed varicella vaccine administered subcutaneously.
MMR vaccineBIOLOGICALMMR vaccine administered subcutaneously or intramuscularly.
Hepatitis A vaccineBIOLOGICALHepatitis A vaccine co-administered intramuscularly.
PCV (pneumococcal conjugate vaccine) 13BIOLOGICALThe 13-valent pneumococcal conjugate vaccine co-administered intramuscularly. In some countries PCV will only be administered depending on the availability, country's registration status and national recommendations for pneumococcal vaccination at the time of study conduct.
PCV 20BIOLOGICALThe 20-valent pneumococcal conjugate vaccine co-administered intramuscularly. In some countries PCV will only be administered depending on the availability, country's registration status and national recommendations for pneumococcal vaccination at the time of study conduct.
VaxneuvanceBIOLOGICALThe Vaxneuvance (15-valent pneumococcal conjugate vaccine) co-administered intramuscularly. In some countries Vaxneuvancewill only be administered depending on the availability, country's registration status and national recommendations for pneumococcal vaccination at the time of study conduct.
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Eligibility Criteria

Age Range12 Months to 15 Months
SexALL
Healthy VolunteersYes
Study Sites22

Inclusion Criteria: * Participant's parent(s)/ Legally acceptable representatives (LAR\[s\]), who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g., completion of the eDiaries, return for follow-up visits). * Written or witnessed/thumb printed info...

Countries:United StatesBelgiumEstoniaGreecePolandRomaniaThailand
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Frequently asked questions about Candidate varicella vaccine

What is the candidate varicella vaccine used for?

The candidate varicella vaccine is used for the prevention of chickenpox in healthy children. It is currently being investigated in a Phase 3 clinical trial for this indication. The vaccine is administered as an intramuscular injection to children aged 12 to 15 months.

Who makes the candidate varicella vaccine?

The candidate varicella vaccine is being developed by GSK plc, a biopharma company listed on the stock exchange under the ticker GSK. GSK is conducting a Phase 3 clinical trial to evaluate the vaccine's immune response and safety in healthy children.

What phase is the candidate varicella vaccine in?

The candidate varicella vaccine is in Phase 3 clinical development. It is an investigational vaccine, meaning it has not yet been approved by regulatory authorities. The ongoing Phase 3 trial is actively recruiting participants to assess the vaccine's safety and immunogenicity.

What clinical trials is the candidate varicella vaccine in?

The candidate varicella vaccine is being studied in a single Phase 3 clinical trial with the identifier NCT06855160. This randomized, active-controlled study is evaluating the immune response and safety of the vaccine when given alongside a marketed measles, mumps and rubella vaccine to healthy children aged 12 to 15 months. The trial is recruiting participants in the United States, Belgium, Estonia, Greece, Poland, Romania, and Thailand.

What does the candidate varicella vaccine target?

The candidate varicella vaccine targets the varicella-zoster virus, which causes chickenpox. By stimulating an immune response against this virus, the vaccine aims to protect vaccinated children from developing the disease. The vaccine is being developed as a preventive measure for this infectious disease.