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Active, Not Recruiting

NCT Number: NCT06592586

A Follow-up Trial of GBS-NN/NN2 Vaccine in Healthy Pregnant Women

The main objective of the study is to evaluate the persistence of the immunoglobulin G (IgG) antibody responses, specific to Alpha-like protein CN (AlpCN), Ribosomal Protein N (RibN), Alpha-like protein 1N (Alp1N), and Alpha-like protein 2 and 3 (Alp2-3N), after a primary vaccination with GBS-NN/NN2 in all participants.

Active, Not Recruiting

This study is active but is not currently recruiting participants.

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Key information

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Participant living in Denmark or South Africa who has participated either in Trial MVX0004 (NCT05154578) or MVX0005 (NCT04596878) and has received at least 1 dose of the GBS-NN/NN2 vaccine.
  • Participant who is able to read and understand and capable of giving personal signed informed consent.
  • Participant who is willing and able to comply with scheduled visits, the investigational plan, and other trial procedures.
  • Participant who is granting access to their trial-related medical records and to their trial materials from Trials MVX0004 or MVX0005, whatever is applicable.
  • Participant who are expected to be available for the duration of the trial and who can be contacted by telephone during trial participation.

Exclusion criteria

  • Any personnel involved in the conduct of the trial (and their family members), including, but not limited to, site staff members, MinervaX employees, and any vendor or contract research organisation (CRO) employees.
  • Participant with confirmed Group B Streptococcus (GBS) infection since participation in Trial MVX0004 or MVX0005.
  • Participant with any psychiatric condition, including recent (within the past year) active suicidal ideation/behaviour that may increase the risk of trial participation or, in the investigator's judgement, make the participant unsuitable for participation in the trial.
  • Participant who participated in other trials involving investigational drug(s) or devices within 28 days prior to trial entry, and/or are participating in other trials involving investigational drug(s) or devices at trial entry, or plan to (continue to) participate in other trials involving investigational drug(s) or devices during this trial.
  • Participant with known or suspected immunodeficiency or cancer or a family history of congenital or hereditary immunodeficiency.
  • Participant receiving chronic administration (defined as more than 14 continuous days) of immunosuppressants or other immune-modifying drugs within 6 months prior to trial entry. An immunosuppressive dose of glucocorticoid will be defined as a systemic dose ≥10 mg of prednisone per day or equivalent. The use of topical, inhaled, and nasal glucocorticoids will be permitted.
  • Participant who received blood, blood products, plasma derivatives, or any immunoglobulin preparations in the 12 weeks prior to trial entry or is planning to receive such products during this trial.
  • Participant with current or history of drug or alcohol abuse, as judged by the investigator.
  • Participant who received any marketed or investigational (other than GBS-NN/NN2 in the MVX0004 or MVX0005 Trial) GBS vaccines or who is planning to receive any marketed or investigational (other than GBS NN/NN2) GBS vaccines during this trial.

Treatment and study plan

GBS-NN/NN2 Vaccine

Biological

0.5 mL (50 μg GBS-NN +50 μg GBS-NN2 adsorbed to 0.5 mg aluminium as Alhydrogel®)

Primary outcomes

  1. All Participants: Concentration of IgG Antibodies to AlpN Proteins in Blood Serum

    Time frame: Up to approximately 5 years

Secondary outcomes

  1. Concentration of IgG Antibodies to AlpN Proteins in Blood Serum Following GBS-NN/NN2 Booster Dose

    Time frame: Pre-dose, 1 month pots-dose, at delivery, and 6 months post-delivery

  2. Difference in Concentration of IgG Antibodies Between Maternal and Cord Blood at Delivery Following GBS-NN/NN2 Booster Dose

    Time frame: Up until delivery, approximately 5 years

  3. Concentration of IgG Antibodies to AlpN Proteins in Blood Serum at Delivery in the Absence of GBS-NN/NN2 Booster Dose

    Time frame: Up until delivery, approximately 5 years

  4. Difference in Concentration of IgG Antibodies Between Maternal and Cord Blood at Delivery in the Absence of GBS-NN/NN2 Booster Dose

    Time frame: Up until delivery, approximately 5 years

  5. Concentration of IgG Antibody to AlpN Proteins in Blood Serum of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: At delivery and at 1 and 3 months post-birth

  6. Concentration of IgG Antibody to AlpN Proteins in Cord Blood of Offspring from Pregnant Participants who did not Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until birth, approximately 5 years

  7. All Participants: Number of Participants Experiencing Procedure-related Serious Adverse Events (SAEs)

    Time frame: Up to approximately 5 years

  8. Number of Participants Experiencing Solicited Local and Systemic Adverse Events (AEs) Among Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to approximately Day 7

  9. Number of Participants Experiencing Unsolicited AEs Among Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to approximately Day 28

  10. Number of Participants Experiencing SAEs Among Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to approximately 6 months post-delivery

  11. Number of Participants Experiencing AE of Special Interest (AESI) Among Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until delivery, approximately 5 years

  12. Gestational Age (GA) of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until birth, approximately 5 years

  13. Weight of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until birth, approximately 5 years

  14. Length of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until birth, approximately 5 years

  15. Head Circumference of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until birth, approximately 5 years

  16. Apgar Score of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up until birth, approximately 5 years

  17. Number of Offspring Experiencing Unsolicited AEs from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to 1 month post-birth, approximately 5 years

  18. Developmental Milestones of Offspring from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose as Assessed by the Ages & Stages Questionnaire, 3rd Edition (ASQ-3)

    Time frame: At 6 months post-birth, approximately 5 years

  19. Number of Offspring Experiencing Medically-attended AEs (MAAEs) from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to 6 months post-birth, approximately 5 years

  20. Number of Offspring Experiencing SAEs from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to 6 months post-birth, approximately 5 years

  21. Number of Offspring Experiencing AESIs from Pregnant Participants who Received the GBS-NN/NN2 Booster Dose

    Time frame: Up to 6 months post-birth, approximately 5 years

Sponsors and collaborators

Lead sponsor

Minervax ApS

Other

Registry information

Official study title

A Follow-up Trial to Assess the Persistence of the Immune Response to the Group B Streptococcus Vaccine (GBS-NN/NN2) After a Primary Vaccination of Healthy Pregnant Women, and to Assess Safety, Reactogenicity, and Immunogenicity of the GBS-NN/NN2 Vaccine When Administered During Follow-Up as a 1 Booster Dose During a New Pregnancy

Important dates

Study start
2025
Primary completion
2029
Study completion
2029
First posted
Sep 19, 2024
Registry last updated
Apr 14, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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