Clinical trial NCT07017777: A Study to Evaluate the Immunogenicity and Safety of 13-valent Pneumococcal Conjugate Vaccine (PCV13i) in Healthy Infants Aged 2 Months (Minimum 6 Weeks)
Official title: A Phase III, Observer-blind, Randomized Controlled Trial to Evaluate the Immunogenicity and Safety of 13-valent Pneumococcal Conjugate Vaccine (PCV13i) in Healthy Infants Aged 2 Months (Minimum 6 Weeks)
Study type: INTERVENTIONAL
Overall status: NOT_YET_RECRUITING
Phase: PHASE3
Conditions: Pneumococcal Infections
Streptococcal Infections
Bacterial Infections
Keywords: PCV13i
13 valent Pneumococcal conjugate vaccine
Pneumococcal infections
2 months of age
Safety
Immunogenicity
Lead sponsor: CanSino Biologics Inc.
Sponsor class: INDUSTRY
First posted: 2025-06-12
Enrollment: 600
Sex: ALL
Minimum age (years): 6
Maximum age (years): 2
Standard ages: CHILD
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: PREVENTION

Brief summary: This is a Phase 3 randomized, observation-blinded, active-controlled, parallel-group clinical trial designed to evaluate the immunogenicity, safety, and functional antibody response of the experimental vaccine versus the control vaccine in healthy Thailand infants vaccinated at a 2+1 schedule (2 months, 4 months and 12-15 months). The trial will enroll approximately 600 healthy infants aged 2 months (at least 6 weeks) who will be randomly assigned in a 1:1 ratio to receive either the experimental or control vaccine, with 100 in each group (200 in total) randomized to subgroups and subject to additional immunogenicity assessments. All participants will be evaluated for solicited adverse events for 7 days and unsolicited adverse events for 30 days post each vaccination. Immunogenicity evaluation will be performed in all participants at baseline and post the booster dose, while the sub-cohort participants will be evaluated for post primary series immunogenicity additionally.


Eligibility criteria: Inclusion Criteria:

* Healthy infants with stable clinical conditions aged 2 months (42-90 days) at the time of screening, based on medical history and clinical assessment by the investigator. Infants will be eligible starting from the day they turn 6 weeks of age.
* Infant's parent or legal guardian must be able and willing to provide informed consent for the infant's participation in the study.
* Participants and their parent or legal guardian must demonstrate the ability to comply with all trial procedures and be available for the entire follow-up duration.
* The infant's parent or legal guardian must have an easily identifiable and stable place of residence within the study area, be available for the duration of trial participation, and have access to a reliable means of telephone contact for communication with the study team.

Exclusion Criteria for the first dose:

* Infants born at \<35 weeks of gestation.
* Infants who have previously received any pneumococcal vaccine.
* Infants currently participating in or who have recently participated in another interventional clinical trial.
* Infants with an axillary temperature of ≥37.8°C at the time of enrollment (the participant must be deferred until recovery. The visit may be rescheduled when this criterion is met.)
* Infants with any congenital abnormalities, chronic medical conditions, or genetic disorders, severe malnutrition, inherited disease and others, that in the investigator's judgment, may interfere with the study outcomes.
* History of anaphylactic shock
* History of allergic disease or history of a serious reaction to any prior vaccination or known hypersensitivity to any component of the experimental and control vaccine
* History of epilepsy and convulsions.
* Have received immunosuppressive treatment, cytotoxic treatment, systemic steroid treatment for more than 2 weeks, etc. (excluding local treatment, surface treatment of acute non-concurrent dermatitis, or spray treatment of allergic rhinitis).
* Received or planned to receive blood/plasma products or immunoglobulins throughout the study period or prior to study vaccination.
* History of coagulation disorders or blood conditions that could cause anemia or excess bleeding as judged by the investigator.
* Infants with known or suspected immunodeficiency, as determined by medical history and/or physical examination.
* Administration of other vaccines within 7 days prior to enrollment.
* Any history or current evidence of a condition or therapy that could confound study results, interfere with participation, or is not in the best interest of the participant, as judged by the investigator.
* The participant is a direct descendant (child or grandchild) of any person employed by the Sponsor, the contract research organization (CRO), the investigator, or study site personnel.
* Any other condition or situation that, in the investigator's judgment, might interfere with the study or pose additional risks to the participant.

Individual termination criteria for subsequent doses:

* Severe allergic reaction after the previous vaccination.
* Serious adverse events caused by the previous vaccination that is not suitable for subsequent vaccination(s) as judged by the investigator.
* Newly identified symptoms or newly occurred cases after the first vaccination that do not meet the inclusion criteria for the first dose, or that meet the exclusion criteria for the first dose. The decision to discontinue participation is determined by the investigator.
* Other reasons for exclusion considered by the investigator.

Primary outcomes:
measure: Proportion of participants achieving serotype-specific IgG antibody concentrations ≥ 0.35 µg/mL
timeFrame: 30 days after the booster dose
measure: Incidence of solicited local and systemic adverse events (AEs)
timeFrame: Within 7 days after each dose of vaccination
Secondary outcomes:
measure: Incidence of unsolicited adverse events
timeFrame: Within 30 days after each dose of vaccination
measure: The number of serious adverse events (SAEs)
timeFrame: Through study completion, an average of 16-19 months
measure: The geometric mean concentration (GMC) of Serotype-specific IgG in all participants
timeFrame: Before vaccination and 30 days after the booster dose
measure: Proportion of participants achieving serotype-specific IgG antibody concentrations ≥ 0.35 µg/mL in Sub-cohort A participants
timeFrame: 30 days after the primary series
measure: Proportion of participants achieving serotype-specific IgG antibody concentrations ≥ 0.35 µg/mL in Sub-cohort B participants
timeFrame: Before the booster dose
measure: The geometric mean concentration (GMC) of Serotype-specific IgG in Sub-cohort A participants
timeFrame: 30 days after the primary series
measure: The geometric mean concentration (GMC) of Serotype-specific IgG in Sub-cohort B participants
timeFrame: Before the booster dose
Other outcomes:
Locations:
Study officials:
affiliation: Department of Pediatrics, Faculty of Medicine Siriraj Hospital, Mahidol University
name: Supattra Rungmaitree, Doctor of Medicine
role: PRINCIPAL_INVESTIGATOR
References: