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VRVg 2

Phase 2

Rabies Virus | Monoclonal antibody | Infectious Disease |Sanofi|Last Updated: Apr 19, 2022

Success Probability

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Trial Design

RandomizedDouble-BlindACTIVE_CONTROLLED
Total Trials1
Total Enrollment320

FDA Designations

No designations recorded

Clinical trial landscape

VRVg 2 · 1 trial · 1 indication

Phase 2 1
NCT03145766Immunogenicity and Safety of a Purified Vero Rabies VaccineRabies Virus
COMPLETED320 Analytics
PHASE2COMPLETED
Immunogenicity and Safety of a Purified Vero Rabies Vaccine
Rabies VirusUnlock trial analytics

Study Endpoints

Primary Endpoints

Rabies Virus Neutralizing Antibody (RVNA) Geometric Mean Titers (GMTs) Against Rabies Virus at Day 0
Day 0

RVNA GMT against rabies virus was assessed using the rapid fluorescent focus inhibition test (RFFIT) assay method.

Rabies Virus Neutralizing Antibody Geometric Mean Titers Against Rabies Virus at Day 14
Day 14

RVNA GMT against rabies virus was assessed using the RFFIT assay method.

Rabies Virus Neutralizing Antibody Geometric Mean Titers Against Rabies Virus at Day 28
Day 28

RVNA GMT against rabies virus was assessed using the RFFIT assay method.

Rabies Virus Neutralizing Antibody Geometric Mean Titers Against Rabies Virus at Day 42
Day 42

RVNA GMT against rabies virus was assessed using the RFFIT assay method.

Rabies Virus Neutralizing Antibody Geometric Mean Titers Against Rabies Virus at Month 7
Month 7

RVNA GMT against rabies virus was assessed using the RFFIT assay method.

Percentage of Participants With Rabies Virus Neutralizing Antibody Titer Greater Than or Equal to (>=) 0.2 IU/mL and >=0.5 IU/mL at Day 0
Day 0

RVNA titer against rabies virus was assessed using the RFFIT assay method. Participants with RVNA titer \>=0.2 IU/mL were considered as seropositive.

Percentage of Participants With Rabies Virus Neutralizing Antibody Titers >=0.2 IU/mL and >=0.5 IU/mL at Day 14
Day 14

RVNA titer against rabies virus was assessed using the RFFIT assay method. Participants with RVNA titer \>=0.2 IU/mL were considered as seropositive.

Percentage of Participants With RVNA Titers >=0.2 IU/mL and >=0.5 IU/mL at Day 28
Day 28

RVNA titer against rabies virus was assessed using the RFFIT assay method. Participants with RVNA titer \>=0.2 IU/mL were considered as seropositive.

Percentage of Participants With RVNA Titers >=0.2 IU/mL and >=0.5 IU/mL at Day 42
Day 42

RVNA titer against rabies virus was assessed using the RFFIT assay method. Participants with RVNA titer \>=0.2 IU/mL were considered as seropositive.

Percentage of Participants With RVNA Titers >=0.2 IU/mL and >=0.5 IU/mL at Month 7
Month 7

RVNA titer against rabies virus was assessed using the RFFIT assay method. Participants with RVNA titer \>= 0.2 IU/mL were considered as seropositive.

Geometric Mean Titer Ratio (GMTR) of Rabies Virus Neutralizing Antibody 7 Days Following Vaccination 3 (Day 14/Day 0)
Day 0 (pre-dose) and Day 14 (7 days post-dose 3)

RVNA titer against rabies virus was assessed using the RFFIT assay method. GMTRs were calculated as the ratio of GMTs 7 days post 3rd vaccination (i.e., on Day 14) and pre-vaccination on Day 0.

Geometric Mean Titer Ratio of Rabies Virus Neutralizing Antibody 14 Days Following Vaccination 4 (Day 28/Day 0)
Day 0 (pre-dose) and Day 28 (14 days post-dose 4)

RVNA titer against rabies virus was assessed using the RFFIT assay method. GMTRs were calculated as the ratio of GMTs 14 days post 4th vaccination (i.e., on Day 28) and pre-vaccination on Day 0.

Geometric Mean Titer Ratio of Rabies Virus Neutralizing Antibody 14 Days Following Vaccination 5 (Day 42/Day 0)
Day 0 (Pre-dose) and Day 42 (14 days Post-dose 5)

RVNA titer against rabies virus was assessed using the RFFIT assay method. GMTRs were calculated as the ratio of GMTs 14 days post 5th vaccination (i.e., on Day 42) and pre-vaccination on Day 0.

Geometric Mean Titer Ratio of Rabies Virus Neutralizing Antibody 6 Months Following Last Vaccination (Month 7/Day 0)
Day 0 (Pre-dose) and Month 7 (6 Months Post Last Vaccination)

RVNA titer against rabies virus was assessed using the RFFIT assay method. GMTRs were calculated as the ratio of GMTs 6 month post last vaccination on Month 7 and pre-vaccination on Day 0.

Percentage of Participants With Complete Virus Neutralization at Starting Dilution (1/5) of Rapid Fluorescent Focus Inhibition Test Assay at Day 0
Day 0

Complete virus neutralization was defined as absence of fluorescent cells at the participant/time point level at the starting dilution (1/5) of the RFFIT assay. Percentage of participants with complete virus neutralization were reported.

Percentage of Participants With Complete Virus Neutralization at Starting Dilution (1/5) of Rapid Fluorescent Focus Inhibition Test Assay at Day 14
Day 14

Complete virus neutralization was defined as absence of fluorescent cells at the participant/time point level at the starting dilution (1/5) of the RFFIT assay. Percentage of participants with complete virus neutralization were reported.

Percentage of Participants With Complete Virus Neutralization at Starting Dilution (1/5) of Rapid Fluorescent Focus Inhibition Test Assay at Day 28
Day 28

Complete virus neutralization was defined as absence of fluorescent cells at the participant/time point level at the starting dilution (1/5) of the RFFIT assay. Percentage of participants with complete virus neutralization were reported.

Percentage of Participants With Complete Virus Neutralization at Starting Dilution (1/5) of Rapid Fluorescent Focus Inhibition Test Assay at Day 42
Day 42

Complete virus neutralization was defined as absence of fluorescent cells at the participant/time point level at the starting dilution (1/5) of the RFFIT assay. Percentage of participants with complete virus neutralization were reported.

Percentage of Participants With Complete Virus Neutralization at Starting Dilution (1/5) of Rapid Fluorescent Focus Inhibition Test Assay at Month 7
Month 7

Complete virus neutralization was defined as absence of fluorescent cells at the participant/time point level at the starting dilution (1/5) of the RFFIT assay. Percentage of participants with complete virus neutralization were reported.

Number of Participants With Immediate Unsolicited Adverse Events
Within 30 Minutes After any Vaccination

An adverse event was defined as any untoward medical occurrence in a participant who received study drug and does not necessary have to have a causal relationship with treatment. An unsolicited AE was an observed AE that did not fulfill the conditions prelisted in the case report form (CRF) in terms of diagnosis and/or onset post-vaccination. All participants were observed for 30 minutes after any vaccination, and any unsolicited AEs occurred during that time were recorded as immediate unsolicited AEs in the CRF. Immediate AEs considered as related to vaccination were recorded as immediate unsolicited adverse reactions (ARs).

Number of Participants With at Least One Solicited Injection Site Reactions
Within 7 Days After any and each vaccination (Vaccination 1, 2, 3, 4 and 5)

A solicited reaction (SR) was an AR observed and reported under conditions (symptoms and onset) prelisted (i.e., solicited) in the CRF and considered as related to vaccination. An AR was all noxious and unintended responses to a medicinal product related to any dose. Solicited injection site reactions included pain, erythema and swelling at and around the injection site.

Number of Participants With at Least One Solicited Systemic Reactions
Within 7 Days After any and each vaccination (Vaccination 1, 2, 3, 4 and 5)

A solicited reaction was an AR observed and reported under the conditions (symptom and onset) prelisted (i.e., solicited) in the CRF and considered as related to vaccination. An AR was all noxious and unintended responses to a medicinal product related to any dose. Solicited systemic reactions included fever, headache, malaise and myalgia.

Number of Participants With at Least One Unsolicited Adverse Events
Within 28 Days After any vaccination

An AE was defined as any untoward medical occurrence in a participant who received study drug and does not necessary have to have a causal relationship with treatment. An unsolicited AE was an observed AE that did not fulfill the conditions prelisted in the CRF in terms of diagnosis and/or onset post-vaccination.

Number of Participants With Serious Adverse Events (SAEs)
From Day 0 up to Month 7

An AE was defined as any untoward medical occurrence in a participant who received study drug and does not necessary have to have a causal relationship with treatment. An SAE was any untoward medical occurrence that at any dose resulted in death; life-threatening; initial or prolonged inpatient hospitalization; persistent or significant disability/incapacity; congenital anomaly/birth defect or a medically important event.

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Study Design & Arms

AllocationRANDOMIZED
MaskingQUADRUPLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Group 1: VRVg-2 Formulation 1EXPERIMENTALVRVg-2 formulation 1, intramuscular (IM) injection on Days 0, 3, 7, 14 and 28. Concomitant administration of human rabies immunoglobulins (HRIG) on Day 0.
Group 2: VRVg-2 Formulation 2EXPERIMENTALVRVg-2 formulation 2, IM injection on Days 0, 3, 7, 14 and 28. Concomitant administration of HRIG on Day 0.
Group 3: VRVg-2 Formulation 3EXPERIMENTALVRVg-2 formulation 3, IM injection on Days 0, 3, 7, 14 and 28. Concomitant administration of HRIG on Day 0.
Group 4: VRVg-1EXPERIMENTALVRVg-1 initial formulation, IM injection on Days 0, 3, 7, 14 and 28. Concomitant administration of HRIG on Day 0.
Group 5: Imovax RabiesACTIVE_COMPARATORImovax Rabies, IM injection on Days 0, 3, 7, 14 and 28. Concomitant administration of HRIG on Day 0.

Interventions

NameTypeDescription
VRVg 2BIOLOGICALModified formulation 1 (Low) of Purified Vero Rabies Vaccine Serum Free
VRVg 1BIOLOGICALInitial formulation of Purified Vero Rabies Vaccine Serum Free
Imovax RabiesBIOLOGICALPurified inactivated rabies vaccine prepared on human diploid cell cultures
Human Rabies Immunoglobulins (HRIG)BIOLOGICALCommercialized formulation of HRIG
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Eligibility Criteria

Age Range18 Years to 65 Years
SexALL
Healthy VolunteersYes
Study Sites5

Inclusion Criteria: An individual must fulfill all of the following criteria in order to be eligible for trial enrollment: 1. Aged 18 to less than 65 years on the day of inclusion. 2. Informed consent form had been signed and dated. 3. Able to attend all scheduled visits and to complied with all t...

Countries:United States
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Frequently asked questions about VRVg 2

What is VRVg 2 used for?

VRVg 2 is a purified Vero rabies vaccine being developed by Sanofi for the prevention of rabies virus infection. It is intended for use in healthy volunteers and is currently in clinical development for rabies prophylaxis.

Who makes VRVg 2?

VRVg 2 is developed by Sanofi, a multinational pharmaceutical company listed on the stock exchange under the ticker SNY. Sanofi is conducting clinical trials to evaluate the vaccine's safety and immunogenicity.

What phase is VRVg 2 in?

VRVg 2 is in Phase 2 clinical development. It has completed a Phase 2 trial and a Phase 3 trial, both of which are finished. The vaccine is investigational and has not been approved by regulatory authorities.

What clinical trials is VRVg 2 in?

VRVg 2 has been studied in two completed trials. NCT03145766 was a Phase 2 trial in the United States with 320 participants, and NCT03965962 was a Phase 3 trial in France with 640 participants, both involving healthy adults aged 18 years and older.

How does VRVg 2 work?

VRVg 2 is a monoclonal antibody vaccine that works by stimulating the immune system to produce antibodies against the rabies virus. It is designed to provide protection against rabies infection when administered before or after exposure.

Is VRVg 2 the same as a purified Vero rabies vaccine?

Yes, VRVg 2 is a purified Vero rabies vaccine. It is manufactured using Vero cells, a standard cell line used for vaccine production, and is being developed as a potential rabies vaccine for human use.