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A study on the safety and immune responses to the GVGH altSonflex1-2-3 vaccine against shigellosis in adults, children, and infants

A staged Phase I/II observer-blind, randomised, controlled, multi-country study to evaluate the safety, reactogenicity, and immune responses to the GVGH altSonflex1-2-3 vaccine against S. sonnei and S. flexneri, serotypes 1b, 2a, and 3a, in adults in Europe (Stage 1) followed by age de-escalation from adults to children and infants, and dose-finding in infants in Africa (Stage 2)

Status
Recruiting
Phases
Phase 2
Study type
Interventional
Source
PACTR
Registry ID
PACTR202208635693932
Enrollment
550
Registered
2022-08-22
Start date
2021-10-06
Completion date
Unknown
Last updated
2026-08-03

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Diarrhoeal disease due to Shigella infection

Interventions

altSonflex123dose C eu
altSonflexplacebo
altSonflex123dose C AF
Boostrix Adult and menveo
altSonflex123dose C Africa child
altSonflex123dose B Africa child
Menveo and typhim Child Middle dose
Menveo and Typhim Vi Child Full dose
altSonflex123 dose C Africa infant safety
altSonflex123 dose B Africa infant safety
altSonflex123 dose A Africa infant safety
Menveo and infanrix Infant safety full dose
Menveo and Infanrix Infant safety medium dose
Menveo Infant safety low dose
altSonflex123 dose C Africa infant dose finding
altSonflex123 dose B Africa infant dose finding
altSonflex123 dose A Africa infant dose finding
Menveo and Infanrix Infant dose finding

Sponsors

GlaxoSmithKline Biologicals
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: All participants: • Participants and/or participants' parent(s)/legally acceptable representative(s) LAR(s), who, in the opinion of the investigator, can and will comply with the requirements of the protocol (e.g. completion of the diary cards, return for follow-up visits). • Written or witnessed/thumb printed informed consent obtained from the participant/parent(s)/LAR(s) of the participant prior to performance of any study specific procedure. • Healthy participants as established by medical history, clinical examination, and laboratory assessment. • Participants satisfying all screening requirements. • Participants seronegative for hepatitis B, and hepatitis C. • Participants negative for human leukocyte antigen B27 (HLA-B27). Adults 18 to 50 years of age: • A male or female between, and including, 18 and 50 years of age at the time of the first study intervention administration. • Female participant of non-childbearing potential may be enrolled in the study. • Female participants of childbearing potential may be enrolled in the study, if the participant: • has practiced adequate contraception for 1 month prior to study intervention administration, and • has a negative pregnancy test on the day of study intervention administration, and • has agreed to continue adequate contraception during the entire treatment period and for 1 month after completion of the study intervention administration series. • Participants seronegative for human immunodeficiency virus (HIV). Children 24 to 59 months of age: • A male or female between, and including, 24 and 59 months of age at the time of first vaccination. • Normal nutritional Z score (-2 standard deviation or greater). • Previously completed routine childhood vaccinations to the best knowledge of the participant's parent(s)/LAR(s). • Born after gestation period of =37 weeks. • Participants seronegative for HIV. • Participants negative for HIV as confirmed by DNA PCR testing

Exclusion criteria

Exclusion criteria: All participants: • Known exposure to Shigella during lifetime of the participant as confirmed during interview with the participant or documented by patient records, recent travel* to a country where Shigella or other enteric infections are endemic, or recent occupation* involving Shigella species. *Limited to Adults 18 to 50 years of age in Europe. • Progressive, unstable or uncontrolled clinical conditions. • History of any reaction or hypersensitivity likely to be exacerbated by any component of the study vaccine. • Any confirmed or suspected immunosuppressive or immunodeficient condition. • Hypersensitivity, including allergy, to medicinal products or medical equipment whose use is foreseen in this study. • Clinical conditions representing a contraindication to IM vaccination and blood draws. o Any behavioural or cognitive impairment or psychiatric disease that, in the opinion of the investigator, may interfere with the participant's ability to participate in the study. o Acute disease and/or fever at the time of enrolment* • Any clinically significant haematological and/or biochemical laboratory abnormality. o Confirmed positive COVID-19 test during the period starting 30 days before the first administration of study vaccines. o Any other clinical condition that, in the opinion of the investigator, might pose additional risk to the participant due to participation in the study. o Administration of long-acting immune-modifying drugs at any time during the study period. o Prior receipt of an experimental Shigella vaccine or live Shigella challenge. o Use of any investigational or non-registered product* other than the study vaccine during the period. • Acute or chronic illness • Chronic administration of immunosuppressants or other immune-modifying drugs • Pregnant or lactating female • History of or current chronic alcohol consumption and/or drug abuse • Administration of immunoglobulins and/or any blood products or plasma derivatives, or bone marrow transplant

Design outcomes

Primary

MeasureTime frame
Anti-serotype specific Shigella lipopolysaccharide (LPS) serum immunoglobulin G (IgG) titers in infants 9 months of age in Africa ;Number of adults 18 to 50 years of age with solicited systemic events;Number of adults 18 to 50 years of age with solicited administration site events;Number of adults 18 to 50 years of age with unsolicited adverse events;Number of adults 18 to 50 years of age with serious adverse events (SAEs);Number of adults 18 to 50 years of age with deviations from normal values of haematological, renal, and hepatic panel test results;Number of children 24 to 59 months of age in Africa with solicited administration site events ;Number of children 24 to 59 months of age in Africa with solicited systemic events ;Number of children 24 to 59 months of age in Africa with unsolicited AEs ;Number of children 24 to 59 months of age in Africa with SAEs;Number of children 24 to 59 months of age in Africa with deviations from normal values of haematological, renal, and hepatic panel test results ;Number of infants 9 months of age in Africa with solicited administration site events;Number of infants 9 months of age in Africa with solicited systemic events ;Number of infants 9 months of age in Africa with unsolicited AEs;Number of infants 9 months of age in Africa with SAEs;Number of infants 9 months of age in Africa with deviations from normal values of haematological, renal, and hepatic panel test results

Secondary

MeasureTime frame
Number of adults 18 to 50 years of age in Europe achieving an ELISA level equivalent to =1:800 titer against S. sonnei LPS;Number of adults 18 to 50 years of age in Africa achieving an ELISA level equivalent to =1:800 titer against S. sonnei LPS;Number of children 24 to 59 months of age in Africa achieving an ELISA level equivalent to =1:800 titer against S. sonnei LPS;Number of infants 9 months of age in Africa achieving an ELISA level equivalent to =1:800 titer against S. sonnei LPS;Number of adults 18 to 50 years of age in Europe achieving an ELISA level equivalent to =1:1600 titer against S. sonnei LPS;Number of adults 18 to 50 years of age in Africa achieving an ELISA level equivalent to =1:1600 titer against S. sonnei LPS;Number of children 24 to 59 months of age in Africa achieving an ELISA level equivalent to =1:1600 titer against S. sonnei LPS;Number of infants 9 months of age in Africa achieving an ELISA level equivalent to =1:1600 titer against S. sonnei LPS;Number of adults 18 to 50 years of age in Europe showing at least a 4-fold increase in anti-serotype specific Shigella LPS/OAg serum IgG concentrations;Number of adults 18 to 50 years of age in Africa showing at least a 4-fold increase in anti-serotype specific Shigella LPS serum IgG titers;Number of children 24 to 59 months of age in Africa showing at least a 4-fold increase in anti-serotype specific Shigella LPS serum IgG titers;Number of infants 9 months of age in Africa showing at least a 4-fold increase in anti-serotype specific Shigella LPS serum IgG titers;Anti-measles IgG concentrations in infants 9 months of age in the dose-finding groups in Africa;Anti-rubella IgG concentrations in infants 9 months of age in the dose-finding groups in Africa;Number of infants 9 months of age in the dose-finding groups in Africa achieving anti-measles IgG concentrations of =150 mIU/mL and =200 mIU/mL;Number of infants 9 months of age in the dose-finding groups in Africa achieving anti-rubella IgG concentratio

Countries

Belgium, Kenya

Contacts

Public ContactCharles Kilel

Kenya Medical Research Institute United States Army Medical Research Directorate Africa Kenya

Charles.kilel@usamru-k.org+254522036100

Outcome results

None listed

Source: PACTR (via WHO ICTRP) · Data processed: Aug 9, 2026