A Phase 1 interventional study of LTB-NG6 and Sodium Chloride 0.9% in Neisseria Gonorrhea, sponsored by LimmaTech Biologics AG. Recruiting at 1 site in Germany. Open to participants aged 18 Years to 50 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-09-23.
Sponsored by LimmaTech Biologics AG · Phase 1, Interventional, and Prevention
The main goal of this trial is to evaluate the safety and immunogenicity of the candidate N. gonorrhoeae vaccine, LTB-NG6.
LTB-NG6 is a vaccine including 6 N. gonorrhoeae antigens. During the study, healthy adults will be randomized to receive 1 of 5 different vaccine doses, or a placebo.
Participants will receive a 2-dose schedule.
167 studies on the registry are indexed under Gonorrhea; 31 are open to participants now.
This study's planned enrollment of 142 is below the median of 400 across 125 interventional studies indexed under Gonorrhea.
Browse Gonorrhea studies →LimmaTech Biologics AG is the lead sponsor of 10 studies on the registry; 1 is open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Participants receive 2 administrations of Sodium chloride 0.9%
Other: Sodium Chloride 0.9%
Participants receive 2 Dose 1 administrations of the investigational product
Biological: LTB-NG6
Participants receive 2 Dose 2 administrations of the investigational product
Biological: LTB-NG6
Participants receive 2 Dose 3 administrations of the investigational product
Biological: LTB-NG6
Participants receive 2 Dose 4 administrations of the investigational product
Biological: LTB-NG6
Participants receive 2 Dose 5 administrations of the investigational product
Biological: LTB-NG6
LTB-NG6 administrated at 5 different doses
sodium chloride 0.9% used as a diluent in LTB-NG6 and as a placebo
Safety: local and systemic AEs (7-days-post)
To evaluate the safety and tolerability of vaccination with LTB-NG6 in healthy participants after each injection in vaccinees vs. placebo and by dose: \- Percentage of participants reporting each solicited local and systemic AE during the seven days after each injection (i.e., day of injection and the six subsequent days).
Time frame: During 7 days following each injection
Safety: any events after each injection
To evaluate the safety and tolerability of vaccination with LTB-NG6 in healthy participants after each injection in vaccinees vs. placebo and by dose: * Percentage of participants reporting any adverse event (AE) following each injection * Percentage of participants reporting each severity level (Grade 1-4) of solicited local, systemic and unsolicited AEs following each injection
Time frame: During 28 days following each injection
Safety: unsolicited AEs, SAEs, MAAEs
To evaluate the safety and tolerability of vaccination with LTB-NG6 in healthy participants after each injection in vaccinees vs. placebo and by dose: * Percentage of participants with unsolicited AEs. * Percentage of participants with serious adverse events (SAEs) following each injection. * Percentage of participants with medically attended adverse events (MAAEs) following each injection.
Time frame: Through study completion, an average of 18 months
Immunogenicity - primary IgGs GMT
To evaluate the immunogenicity of different doses of LTB-NG6 to identify the preferred dose(s). Serum IgG geometric mean titers (GMTs) against each of the N. gonorrhoeae antigens included in LTB-NG6 summarized by treatment group
Time frame: At 28 days after the second injection
Immunogenicity - secondary IgGs
To expand the evaluation of the immunogenicity of LTB-NG6 for each treatment group at baseline and 28 days after each injection for each of the antigens included in LTB-NG6: * Serum IgG GMTs (except for primary endpoint) * Serum IgG geometric mean fold ratio (GMFR) * Percentage of participants with ≥ 4-fold increase in serum IgG titer.
Time frame: At baseline and 28 days after the second injection
Safety: AEs relatedness to injection, vaccine vs. placebo
To further evaluate the safety of LTB-NG6. Percentage of participants with solicited local, systemic, unsolicited AEs, and SAEs according to relatedness to injection, in vaccinees vs. placebo.
Time frame: Through study completion, an average of 18 months
Safety: lab abnormalities
To evaluate changes in hematological and blood chemistry parameters following each injection. Percentage of participants with hematological and blood chemistry laboratory abnormalities at 7 days after each injection compared to baseline in vaccinees vs. placebo.
Time frame: At baseline and 7 days after each injection
Plan to share: No
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LimmaTech Biologics AG