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Experimental vaccine

Phase 3

Poliomyelitis | Monoclonal antibody | Infectious Disease |Sinovac Biotech, Ltd|Last Updated: Aug 10, 2026

Target and mechanism

ModalityMonoclonal antibody

Also known as Low-dose experimental vaccine

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment1,572

FDA Designations

No designations recorded

Clinical trial landscape

Experimental vaccine · 5 trials · 3 indications

Phase 3 5
NCT07505810Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 3-5 MonthsEpidemic Meningitis
RECRUITING880 Analytics
NCT07505823Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 6-11 MonthsEpidemic Meningitis
RECRUITING1,040 Analytics
NCT07505836Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 12-23 MonthsEpidemic Meningitis
RECRUITING1,040 Analytics
NCT07505888Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 2-6 YearsEpidemic Meningitis
ACTIVE NOT_RECRUITING660 Analytics
NCT05386810Safety of Sabin Inactivated Poliovirus Vaccine in Adults, Children and Infants and Lot Consistency Immunogenicity, and Safety of the msIPV in 2 Months Old InfantsPoliomyelitis
COMPLETED1,572 Analytics
PHASE3RECRUITING
Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 3-5 Months
Epidemic MeningitisUnlock trial analytics
PHASE3RECRUITING
Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 6-11 Months
Epidemic MeningitisUnlock trial analytics
PHASE3RECRUITING
Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 12-23 Months
Epidemic MeningitisUnlock trial analytics
PHASE3ACTIVE NOT_RECRUITING
Phase Ⅲ Trial of Group ACYW135 Meningococcal Conjugate Vaccine in Children Aged 2-6 Years
Epidemic MeningitisUnlock trial analytics
PHASE3COMPLETED
Safety of Sabin Inactivated Poliovirus Vaccine in Adults, Children and Infants and Lot Consistency Immunogenicity, and Safety of the msIPV in 2 Months Old Infants
PoliomyelitisUnlock trial analytics

Study Endpoints

Primary Endpoints

seroconversion rates (%) of Nm antibodies for serogroups A, C, Y, W135
Day 30 after three-dose vaccination

seroconversion rates of Nm antibodies for serogroups A, C, Y, W135 at Day 30 after three-dose vaccination in baseline seronegative participants (pre-vaccination titer \<1:8)

GMTs (1:) of Nm antibodies for serogroups A, C, Y, W135
Day 30 after three-dose vaccination

GMTs of Nm antibodies for serogroups A, C, Y, W135 at Day 30 after three-dose vaccination in baseline seronegative participants (pre-vaccination titer \<1:8)

Safety index-incidence of adverse reactions
Within 30 days after each dose

Incidence of adverse reactions within 30 days after each dose

Immunogenicity index-Geometric mean titers (GMT)
30 days after primary immunization

GMT 30 days after primary immunization in msIPV vaccination group

Immunogenicity index- seroconversion rate of neutralizing antibody
30 days after primary immunization

Seroconversion rate of neutralizing antibody 30 days after primary immunization in combined experiment group and IPV control group

Secondary Endpoints

seropositive rates (%) of Nm antibodies for serogroups A, C, Y, W135
Day 30 after three-dose vaccination
GMIs of Nm antibodies for serogroups A, C, Y, W135
Day 30 after three-dose vaccination
seroconversion rates (%) and seropositive rates (%) of Nm antibodies for serogroups A, C, Y, W135
Day 30 after three-dose vaccination
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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
experimental groupEXPERIMENTAL -
active comparator groupACTIVE_COMPARATOR -
Safety group in adultsEXPERIMENTAL24 adults will receive one dose of 5-person sIPV vaccine to evaluate the safety of msIPV vaccine.
Safety group in childrenEXPERIMENTAL24 children will receive one dose of 5-person sIPV vaccine to evaluate the safety of msIPV vaccine.
Safety group in infantsEXPERIMENTAL24 infants will receive 4 doses of vaccine according to the primary immunization schedule of 0,1,2 months and booster immunization schedule of 18 months to evaluate the safety of msIPV vaccine .
Experimental Vaccine-lot 1EXPERIMENTAL300 infants will receive 4 doses of 5-person sIPV vaccine of commercial scale lot 1 according to the primary immunization schedule of 0,1,2 months and booster immunization schedule of 18 months.
Experimental Vaccine-lot 2EXPERIMENTAL300 infants will receive 4 doses of 5-person sIPV vaccine of commercial scale lot 2 according to the primary immunization schedule of 0,1,2 months and booster immunization schedule of 18 months.
Experimental Vaccine-lot 3EXPERIMENTAL300 infants will receive 4 doses of 5-person sIPV vaccine of commercial scale lot 3 according to the primary immunization schedule of 0,1,2 months and booster immunization schedule of 18 months.
IPV control groupACTIVE_COMPARATOR300 infants will receive 4 doses of IPV vaccine produced by Pasteur according to the primary immunization schedule of 0,1,2 months and booster immunization schedule of 18 months.
single-person sIPV control groupACTIVE_COMPARATOR300 infants will receive 4 doses of single-dose sIPV vaccine produced by Pasteur according to the primary immunization schedule of 0,1,2 months and booster immunization schedule of 18 months.

Interventions

NameTypeDescription
experimental vaccineBIOLOGICALGroup ACYW135 Meningococcal Conjugate Vaccine
Active Comparator vaccineBIOLOGICALGroup ACYW135 Meningococcal Conjugate Vaccine (CRM197)
IPV control vaccineBIOLOGICALInactivated Poliovirus Vaccine - control vaccine produced by Sanofi. Inactivated poliovirus antigens: Mahoney strain for type 1 (40DU), MEF-1 strain for type 2 (8DU), Saukett strains for type 3 (32DU) in 0.5 ml mixture of 2- phenoxyethanol,ethanol,formaldehyde,hanks199 medium (containing amino acids, mineral salts, vitamins, glucose, polysorbate 80 and water for injection),hydrochloric acid or sodium hydroxide (for pH value adjustment),trace amounts of antibiotics (neomycin, streptomycin and polymyxin B)for per injection.
single-person sIPV control vaccineBIOLOGICALSabin Inactivated Poliovirus Vaccine (Vero cell) (0.5ml) -control vaccine produced by Sinovac Biotech Co., Ltd. Inactivated Sabin poliovirus antigen: type 1 (15DU), type 2 (45DU), and type 3 (45DU)in 0.5 ml mixture of medium 199,glycine,formaldehyde,sodium chloride,potassium chloride,calcium chloride,magnesium sulfate,disodium phosphate,sodium dihydrogen phosphate for per injection.
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Eligibility Criteria

Age Range3 Months to 5 Months
SexALL
Healthy VolunteersYes
Study Sites2

Inclusion Criteria: 1. Healthy participants aged 3 to 5 months. 2. The participant's legal guardian is capable of understanding and voluntarily signs the informed consent form. 3. Willing and able to comply with all scheduled visits, sample collection, vaccination, and other trial procedures. 4. Pr...

Countries:China
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Recent Changes (Last 90 Days)

LOWAug 11, 2026NCT07505810Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 11, 2026NCT07505836Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 11, 2026NCT07505823Status: NOT_YET_RECRUITING → RECRUITING
MEDIUMAug 11, 2026NCT07505888Status: NOT_YET_RECRUITING → ACTIVE_NOT_RECRUITING
LOWAug 11, 2026NCT07505836Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 11, 2026NCT07505823Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 11, 2026NCT07505810Status: NOT_YET_RECRUITING → RECRUITING
MEDIUMAug 11, 2026NCT07505888Status: NOT_YET_RECRUITING → ACTIVE_NOT_RECRUITING
LOWAug 11, 2026NCT07505823Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 11, 2026NCT07505810Status: NOT_YET_RECRUITING → RECRUITING
LOWAug 11, 2026NCT07505836Status: NOT_YET_RECRUITING → RECRUITING
MEDIUMAug 11, 2026NCT07505888Status: NOT_YET_RECRUITING → ACTIVE_NOT_RECRUITING

Frequently asked questions about Experimental vaccine

What is the Experimental vaccine used for?

The Experimental vaccine is an investigational vaccine being developed for the prevention of Epidemic Meningitis, specifically meningococcal disease caused by groups A, C, Y, and W135. It is also being studied for use in Poliomyelitis and Herpes Zoster, though its primary clinical trials focus on meningococcal conjugate vaccination in children.

Who makes the Experimental vaccine?

The Experimental vaccine is being developed by Sinovac Biotech, Ltd, a biopharmaceutical company traded on the NASDAQ under the ticker symbol SVA. The company is conducting Phase 3 clinical trials for this vaccine candidate in China.

What phase is the Experimental vaccine in?

The Experimental vaccine is currently in Phase 3 clinical development. It is an investigational vaccine, meaning it has not yet been approved by regulatory authorities. All four of its registered clinical trials are Phase 3 studies, with three actively recruiting participants and one active but not recruiting.

What clinical trials is the Experimental vaccine in?

The Experimental vaccine is being evaluated in four Phase 3 clinical trials in China, all studying its use against Epidemic Meningitis. These trials are NCT07505810 (children aged 3-5 months), NCT07505823 (children aged 6-11 months), NCT07505836 (children aged 12-23 months), and NCT07505888 (children aged 2-6 years).

Is the Experimental vaccine the same as the Low-dose experimental vaccine?

Yes, the Experimental vaccine is also known as the Low-dose experimental vaccine. This alternative name may be used in some contexts to refer to the same vaccine candidate being developed by Sinovac Biotech for meningococcal disease prevention.

How does the Experimental vaccine work?

The Experimental vaccine is a meningococcal conjugate vaccine designed to protect against Neisseria meningitidis serogroups A, C, Y, and W135. By presenting these bacterial antigens to the immune system, it stimulates the production of protective antibodies that can prevent meningococcal infection and the associated epidemic meningitis.