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AltSonflex1-2-3

Phase 2

Diarrhoea | Monoclonal antibody | Gastrointestinal |GSK plc|Last Updated: Jan 6, 2026

Success Probability

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment528

FDA Designations

No designations recorded

Clinical trial landscape

AltSonflex1-2-3 · 1 trial · 1 indication

Phase 2 1
NCT07320716Long-Term Immunogenicity of the altSonflex1-2-3 Shigella Vaccine in African ChildrenDiarrhoea
NOT YET_RECRUITING528 Analytics
PHASE2NOT YET_RECRUITING
Long-Term Immunogenicity of the altSonflex1-2-3 Shigella Vaccine in African Children
DiarrhoeaUnlock trial analytics

Study Endpoints

Primary Endpoints

Anti-serotype specific Shigella lipopolysaccharide (LPS)/O-antigen (OAg) serum immunoglobulin G (IgG), as measured by GVGH enzyme-linked immunosorbent assay . (ELISA)
At Visit 1 of the current study (12 months after last vaccination in the parent studies)

S. sonnei, S. flexneri 1b, S. flexneri 2a, and S. flexneri 3a serotypes will be tested.

Anti-serotype specific Shigella LPS/OAg serum IgG, as measured by GVGH ELISA
At Visit 2 of the current study (24 months after last vaccination in the parent studies)

S. sonnei, S. flexneri 1b, S. flexneri 2a, and S. flexneri 3a serotypes will be tested.

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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposePREVENTION

Treatment Arms

ArmTypeDescription
H06_01TP Study_Infants_Selected doseEXPERIMENTALInfants who received 3 doses of the altSonflex1-2-3 vaccine on Day 1, Day 85, and Day 253 in the H06\_01TP parent study.
H06_01TP Study_ ST2_Infants_ControlACTIVE_COMPARATORInfants who received 2 doses of the Menveo vaccine on Day 1 and Day 85, and 1 dose of the Infanrix hexa vaccine on Day 281 in the H06\_01TP parent study.
H06_02TP Study_Infants_Selected doseEXPERIMENTALInfants who received 2 doses of the altSonflex1-2-3 vaccine on Day 1 and Day 169 in the H06\_02TP parent study.
H06_02TP Study_ Infants_ControlACTIVE_COMPARATORInfants who received 1 dose of the TYPHIBEV vaccine on Day 1 and 1 dose of the Infanrix hexa vaccine on Day 169 in the H06\_02TP parent study.

Interventions

NameTypeDescription
AltSonflex1-2-3BIOLOGICALNo intervention is administered in this extension study. The selected dose of altSonflex1-2-3 vaccine was administered intramuscularly in the participants' thigh during the H06\_01TP (212149) parent study on Day 1, Day 85, and Day 253; or on Day 1 and Day 169 during the H06\_02TP (219449) study.
MenveoBIOLOGICALNo intervention is administered in this extension study. The Menveo vaccine was administered intramuscularly in the participants' thigh on Day 1 and Day 85 during the H06\_01TP (212149) parent study.
Infanrix hexaBIOLOGICALNo intervention is administered in this extension study. The Infanrix hexa vaccine was administered intramuscularly in the participants' thigh on Day 281 during the H06\_01TP (212149) study; or on Day 169 during the H06\_02TP (219449) parent study.
TYPHIBEVBIOLOGICALNo intervention is administered in this extension study. The TYPHIBEV vaccine was administered intramuscularly in the participants' thigh on Day 1 during the H06\_02TP (219449) parent study.
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Eligibility Criteria

Age Range26 Months to 55 Months
SexALL
Healthy VolunteersYes

Inclusion Criteria: * Children who, as infants, previously participated in two completed studies (H06\_01TP or H06\_02TP) and were vaccinated with 3 or 2 doses of altSonflex1-2-3 or control vaccines, respectively, completed all previous vaccinations and are 12±1 months after the last altSonflex1-2-...

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Frequently asked questions about AltSonflex1-2-3

What is AltSonflex1-2-3 used for?

AltSonflex1-2-3 is an investigational monoclonal antibody being developed for diarrhoea. It is currently in Phase 2 clinical development and is being studied in a trial that evaluates its long-term immunogenicity in African children. The drug is not yet approved and remains under investigation.

Who makes AltSonflex1-2-3?

AltSonflex1-2-3 is being developed by GSK plc, a biopharmaceutical company listed on the stock exchange under the ticker GSK. The company is conducting a Phase 2 clinical trial to evaluate the drug's long-term immunogenicity in African children with diarrhoea.

What phase is AltSonflex1-2-3 in?

AltSonflex1-2-3 is in Phase 2 clinical development. It is an investigational drug for diarrhoea and has not been approved by regulatory authorities. The ongoing Phase 2 trial is designed to assess the long-term immunogenicity of the drug in African children.

What clinical trials is AltSonflex1-2-3 in?

AltSonflex1-2-3 is being studied in one Phase 2 clinical trial with the identifier NCT07320716. The trial, titled 'Long-Term Immunogenicity of the altSonflex1-2-3 Shigella Vaccine in African Children', is not yet recruiting and has a planned enrollment of 528 participants.

Is AltSonflex1-2-3 the same as altSonflex1-2-3?

Yes, AltSonflex1-2-3 is the same as altSonflex1-2-3. The drug is referred to by both names, with the clinical trial title using the lowercase 'altSonflex1-2-3' format. Both names refer to the same investigational monoclonal antibody for diarrhoea.