Clinical Trial Investigating the Safety and Immunogenicity of GBS6 in Pregnant Women With and Without HIV (PREPARE)

Group B Streptococcal Infection Clinical Trial

— PREPARE  

Official title:

A Placebo Controlled Clinical Trial Investigating the Safety and Immunogenicity of GBS6 in Pregnant Women With and Without Human Immunodeficiency Virus (HIV) Infection and Their Infants

Clinical Trial Details — Status: Active, not recruiting

Administrative data

• NCT number: NCT05832502
• Other study ID #: 2020.0317
• Status: Active, not recruiting
• Phase: Phase 2
• Start date: October 14, 2022
• Est. completion date: September 30, 2025

Study information

• Verified date: November 2023
• Source: St George's, University of London
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

A placebo controlled clinical trial investigating the safety and immunogenicity of GBS6 in pregnant women with and without human immunodeficiency virus (HIV) infection and their infants

Description:

This Phase 2, randomised, placebo controlled, double blinded study will be the first evaluation of the investigational GBS6 in HIV-infected pregnant women. This study will enroll pregnant women with and without HIV to receive GBS6 or Placebo in order to provide an expanded safety and immunogenicity data set (for both pregnant women and their infants) and to support progression of the development of this vaccine.

Recruitment information / eligibility

• Status: Active, not recruiting
• Enrollment: 300
• Est. completion date: September 30, 2025
• Est. primary completion date: September 30, 2025
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Female
• Age group: 18 Years to 40 Years

Eligibility

Inclusion Criteria:

Inclusion criteria for Maternal Participants

1. Age = 18 to = 40 years of age, inclusive at day of signing the ICF.

2. Pregnant at = 27 0/7 to =35 6/7 gestation on the day of planned vaccination, verified by ultrasound scan (U/S).

3. Low risk, singleton pregnancy, as assessed by the study physician based on ultra-sound scan and previous obstetric history.

4. Documented negative HBV surface antigen, HCV antibody, and syphilis tests at screening.

5. Documented HIV test during pregnancy undertaken as per the national guidelines.

6. If HIV infected pregnant women, stable on ART for at least 3 months prior to study start

7. Determined by medical history, physical examination, screening laboratory assessment, and clinical judgment to be appropriate for inclusion in the study.

8. Receiving prenatal standard of care including HIV care if applicable at the clin-ics/physician offices/hospital network affiliated with the clinical study site.

9. Willing to give birth at Kawempe Specialised National Referral Hospital, or Kisenyi Health center IV, Uganda.

10. Willing and able to participate for the duration of the study visits and follow-up until 12-months post-delivery.

11. Willing and able to be contacted by telephone for the full duration of the study, and to give informed consent for their infant participant to participate in the study.

Inclusion criteria for Infants Inclusion criteria for Infants

1. Parent(s) willing and able to comply with scheduled visits, investigational plan, laboratory tests, and other study procedures.

Exclusion Criteria:

Exclusion criteria for Maternal Participants

Any of the following:

1. Investigator site staff members directly involved in the conduct of the study and their family members, site staff members otherwise supervised by the investigator, or participants who are Pfizer employees, including their family members, directly involved in the conduct of the study.

2. Participants whose unborn baby have been fathered by investigational site staff members directly involved in the conduct of the study or their family members, site staff members otherwise supervised by the investigator, or Pfizer employees directly involved in the conduct of the study.

3. Participation in other studies involving investigational drug(s), vaccines, or medical devices within 28 days prior to study entry and/or during study participation.

4. Previous vaccination with any licensed or investigational GBS vaccine.

5. History of severe adverse reaction associated with a vaccine and/or severe allergic reaction (e.g., anaphylaxis) to any component of the investigational product.

6. History of microbiologically proven invasive disease caused by GBS, or history of an infant with GBS disease.

7. Current alcohol abuse or illicit drug use.

8. Body mass index (BMI) of =40 kg/m2 at the time of the screening visit.

9. Clinical history of primary genital herpes simplex virus (HSV) infection during the current pregnancy.

10. A prior history of or current pregnancy complications or abnormalities that will increase the risk associated with the participant's participation in, and completion of, the study, including but not limited to the following (refer to the SRM) for further details):

1. Gestational hypertension or preeclampsia eclampsia

2. Placental abnormality

3. Polyhydramnios or oligohydramnios

4. Significant bleeding or blood clotting disorder

5. Gestational diabetes

6. Any signs of premature labour with the current pregnancy

11. Prior late stillbirth (defined as loss of pregnancy at any time after 28 weeks gestation) or neonatal death (defined as death of an infant within the first 28 days of life), prior low birth weight baby (defined as infant <2500 g) or premature delivery (defined as delivery before 37 0/7 weeks gestation), prior history of at least 3 miscarriages, prior pregnancies numbering greater than 5, or previous infant with a known or suspected genetic disorder or major congenital anomaly

12. Confirmed GBS bacteriuria during the current pregnancy

13. Major illness of the mother (outside of HIV serostatus) or conditions of the foetus that, in the investigator's judgment, will substantially increase the risk associated with the participant's participation in, and completion of, the study or could preclude the evaluation of the participant's response, including but not limited to the following (refer to the SRM) for further details):

g. hypertension requiring treatment h. heart disease i. lung disease j. neurological disorders including a history of epilepsy or recurrent afebrile seizures k. kidney disease l. liver disease m. haematological disorders (including sickle cell disease) n. severe anaemia (less than 7.0g/dL) o. significant bleeding or blood clotting disorder p. endocrine disorders including known diabetes mellitus

14. Participants with known or suspected immunodeficiency (outside of HIV positive sero-status).

15. Participants who receive treatment with immunosuppressive therapy including cytotoxic agents or systemic corticosteroids, e.g., for cancer or an autoimmune disease, or planned receipt through the postvaccination blood draw. Inhaled/nebulised, intra articular, intra-bursal, or topical (skin or eyes) corticosteroids are permitted.

16. Receipt of blood/plasma products or immunoglobulin, from 60 days before investigational product administration, or planned receipt through delivery.

17. Known to be Rhesus Negative

18. Psychiatric condition including recent (within the last year) or active suicidal ideation or behaviour or laboratory abnormalities that may increase the risk associated with study participation or investigational product administration or may interfere with the interpretation of study results and, in the judgment of the investigator, would make the participant inappropriate for entry into this study.

19. Deprived of freedom by an administrative or court order, or in an emergency setting, or hospitalised involuntarily.

Related Conditions & MeSH terms

• Group B Streptococcal Infection
• Infections
• Streptococcal Infections

Intervention

Drug:
• GBS6
The investigational products are GBS6 and placebo (saline control). The GBS6 dose will be GBS6 20mcg without AlPO4 (equivalent to 240 mcg/mL) 0.5mL dose or 20 mcg CPS/serotype).
• Placebo
Placebo (saline control) administered intramuscularly by injecting 0.5 mL into the deltoid muscle

Locations

Country	Name	City	State
Uganda	Makerere University, John Hopkins University	Kawempe

Sponsors (3)

Lead Sponsor	Collaborator
St George's, University of London	MU-JHU CARE, Pfizer

Country where clinical trial is conducted

Uganda, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Other	Mother Exploratory outcome 1 - Ratio Placental transfer ratio of GBS-specific antibodies in HIV-exposed and unexposed pregnancies.	1. Fold increase in GBS serotype specific IgG antibody titres over baseline measured before vaccination through 12 months after delivery in HIV positive and HIV negative women.	Baseline through 12 months after delivery
Other	Mother Exploratory outcome 2 - Percentage Serotype specific GBS positive vaginal and/or rectal culture(s) in HIV positive and HIV negative women.	2. Percentage Serotype specific GBS positive vaginal and/or rectal culture(s) before vaccination, at delivery, and 6 weeks after delivery in HIV positive and HIV negative women.	Baseline
Other	Mother Exploratory outcome 2 - Percentage Serotype specific GBS positive vaginal and/or rectal culture(s) in HIV positive and HIV negative women.	2. Percentage Serotype specific GBS positive vaginal and/or rectal culture(s) at delivery in HIV positive and HIV negative women.	Delivery
Other	Mother Exploratory outcome 2 - Percentage Serotype specific GBS positive vaginal and/or rectal culture(s) in HIV positive and HIV negative women.	2. Percentage Serotype specific GBS positive vaginal and/or rectal culture(s) at 6 weeks after delivery in HIV positive and HIV negative women.	6 weeks after delivery
Other	Mother Exploratory outcome 3 - Concentration GBS serotype specific IgG and IgA antibody titres in breast milk following vaccination of women living with HIV and their unexposed counterparts	3. Concentration GBS serotype specific IgG and IgA antibody titres in breast milk following vaccination of women living with HIV and their unexposed counterparts in colostrum (within 72 hours of delivery)	within 72 hours after delivery
Other	Mother Exploratory outcome 3 - Concentration GBS serotype specific IgG and IgA antibody titres in breast milk following vaccination of women living with HIV and their unexposed counterparts	3. Concentration GBS serotype specific IgG and IgA antibody titres in breast milk following vaccination of women living with HIV and their unexposed counterparts in breast milk at 6 weeks after delivery.	6 weeks after delivery
Other	Mother Exploratory outcome 3 - Concentration GBS serotype specific IgG and IgA antibody titres in breast milk following vaccination of women living with HIV and their unexposed counterparts	3. Concentration GBS serotype specific IgG and IgA antibody titres in breast milk following vaccination of women living with HIV and their unexposed counterparts in breast milk at 18 weeks after delivery.	18 weeks after delivery
Other	Infant Exploratory outcome 1 - Concentration IgG antibody titres to vaccines included in the extended programme of vaccination administered to HIV-exposed and unexposed infant participants	Concentration IgG antibody titres to vaccines included in the extended programme of vaccination administered to HIV-exposed and unexposed infant participants as part of at 18 weeks of age	18 weeks of age
Other	Infant Exploratory outcome 1 - Concentration IgG antibody titres to vaccines included in the extended programme of vaccination administered to HIV-exposed and unexposed infant participants	Concentration IgG antibody titres to vaccines included in the extended programme of vaccination administered to HIV-exposed and unexposed infant participants as part of at 12 months of age.	12 months of age
Other	Infant Exploratory outcome 2 - Concentration Serotype specific GBS positive nasal/rectal cultures in infant participants	2. Concentration Serotype specific GBS positive nasal/rectal cultures at delivery in infant participants.	Delivery
Other	Infant Exploratory outcome 2 - Concentration Serotype specific GBS positive nasal/rectal cultures in infant participants	2. Concentration Serotype specific GBS positive nasal/rectal cultures at 6 weeks after delivery in infant participants.	6 weeks after delivery
Other	Infant Exploratory outcome 2 - Concentration Serotype specific GBS positive nasal/rectal cultures in infant participants	2. Concentration Serotype specific GBS positive nasal/rectal cultures at 18 weeks after delivery in infant participants.	18 weeks after delivery
Other	Infant Exploratory outcome 3 - Concentration GBS serotype specific IgG antibody titres measured from dried blood spots in infant participants.	3. Concentration GBS serotype specific IgG antibody titres measured from dried blood spots in infant participants at birth.	At birth
Primary	Primary mother outcome 1	1. Percentage Occurrence of solicited local reactions within 7 days following administration of investigational product (pain at the injection site, redness, and swelling).	7 days following administration of IMP
Primary	Primary mother outcome 2	2. Percentage Occurrence of solicited systemic events within 7 days following administration of investigational product (fever, nausea/vomiting, diarrhoea, headache, fatigue/tiredness, muscle pain, and joint pain).	7 days following administration of IMP
Primary	Primary mother outcome 3	3. Percentage Occurrence of solicited and unsolicited adverse events through 1 month after administration of investigational product.	Through 1 month following administration of IMP
Primary	Primary mother outcome 4	4. Number Occurrence of SAEs, MAEs, and obstetric complications (peripartum, intrapartum, and postpartum) throughout the study (Visit 1 through the 12 month postdelivery study visit) and any unsolicited events leading to study withdrawal.	Visit 1 through 12 months post-delivery
Primary	Primary Infant outcome 1	1. Number Occurrence of unsolicited adverse events from birth to 6 weeks of age	Birth to 6 weeks of age
Primary	Primary Infant outcome 2	2. Number Occurrence of SAEs, AEs of special interest (major congenital anomalies, developmental delay, and suspected or confirmed GBS infection), and MAEs through 12 months of age and any unsolicited events leading to study withdrawal.	Through 12 months of age
Secondary	Secondary mother Outcome 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV positive and HIV negative women	1. Geometric mean concentration GBS serotype specific IgG antibody titres measured at baseline in HIV positive and HIV negative women.	Baseline
Secondary	Secondary mother Outcome 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV positive and HIV negative women	1. Geometric mean concentration GBS serotype specific IgG antibody titres measured at 2 weeks after vaccination in HIV positive and HIV negative women.	2 weeks after vaccination
Secondary	Secondary mother Outcome 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV positive and HIV negative women	1. Geometric mean concentration GBS serotype specific IgG antibody titres measured at 1 month after vaccination in HIV positive and HIV negative women.	1 month after vaccination
Secondary	Secondary mother Outcome 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV positive and HIV negative women	1. Geometric mean concentration GBS serotype specific IgG antibody titres measured at delivery in HIV positive and HIV negative women.	Delivery
Secondary	Secondary mother Outcome 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV positive and HIV negative women	1. Geometric mean concentration GBS serotype specific IgG antibody titres measured at 6 weeks after delivery in HIV positive and HIV negative women.	6 weeks after delivery
Secondary	Secondary Mother Objective 2 - Geometric mean concentration GBS serotype specific IgG titres in HIV positive and HIV negative women	2. Geometric mean concentration GBS serotype specific IgG titres measured at baseline in HIV positive and HIV negative women.	Baseline
Secondary	Secondary Mother Objective 2 - Geometric mean concentration GBS serotype specific IgG titres in HIV positive and HIV negative wome	2. Geometric mean concentration GBS serotype specific IgG titres measured at delivery in HIV positive and HIV negative women.	Delivery
Secondary	Secondary infant Objective 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV-exposed and unexposed infant participants	1. Geometric mean concentration GBS serotype specific IgG antibody titres in HIV-exposed and unexposed infant participants measured at birth	Birth
Secondary	Secondary infant Objective 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV-exposed and unexposed infant participants	1. Geometric mean concentration GBS serotype specific IgG antibody titres in HIV-exposed and unexposed infant participants measured at 18 weeks of life.	18 weeks
Secondary	Secondary infant Objective 1 - Geometric mean concentration GBS serotype specific IgG antibody titres in HIV-exposed and unexposed infant participants	1. Geometric mean concentration GBS serotype specific IgG antibody titres in HIV-exposed and unexposed infant participants measured at 12 months of life.	12 months of life
Secondary	Secondary infant Objective 2 - Geometric mean concentration GBS serotype specific IgG titres in HIV-exposed and unexposed infant participants	2. Geometric mean concentration GBS serotype specific IgG titres in HIV-exposed and unexposed infant participants measured at 18 weeks of life.	18 weeks of life
Secondary	Secondary infant Objective 3 - Ratio Placental transfer ratio of GBS-specific antibodies in HIV-exposed and unexposed pregnancies.	3. Ratio Placental transfer ratio of GBS-specific antibodies in HIV-exposed and unexposed pregnancies.	Delivery