Clinical Trial of PCV24 in Children Aged 2-17 Years

A Randomized, Double-blind, Controlled Combined With Open-label Phase Ia Clinical Trial to Evaluate the Safety and Immunogenicity of 24-valent Pneumococcal Conjugate Vaccine in Children Aged 2-17 Years.

A Phase Ia clinical trial of 24-valent pneumococcal conjugate vaccine (PCV24) developed by Sinovac Life Science Co., Ltd will be conducted in children aged 2-17 years. The objective of the study is to evaluate the safety and immunogenicity of Sinovac PCV24. The trial is a randomized, double-blind, controlled combined with open-label phase Ia clinical trial.

Study Overview

• Status: Completed
• Conditions: Pneumococcal Infectious Disease
• Intervention / Treatment: Biological: Sinovac PCV24 formulation 1; Biological: Sinovac PCV24 formulation 2; Biological: Prevenar13®

Detailed Description

A phase Ia clinical trial of the study of 24-valent Pneumococcal Conjugate Vaccine (PCV24) developed by Sinovac Life Science Co., Ltd (Sinovac) will be conducted in Chinese children aged 2-17 years. The trial is a randomized, double-blind, controlled combined with open-label study. The objective of this study is to evaluate the safety and immunogenicity of PCV24 manufactured by Sinovac Life Science Co., Ltd. The active control vaccine for participants aged 2-5 years is the Prevenar13® manufactured by Pfizer.

A total of at least 114 participants will be enrolled, including 24 children aged 6-17 years and 90 children aged 2-5 years. Children aged 6-17 years will receive PCV24 formulation 1 and PCV24 formulation 2 in a 1:1 ratio. Children aged 2-5 years will receive PCV24 formulation 1, PCV24 formulation 2 and Prevenar13® in a 1:1:1 ratio.

• Study Type: Interventional
• Enrollment (Actual): 119
• Phase: Phase 1

Contacts and Locations

Study Locations

• China
  • Jiangsu
    • Nanjing, Jiangsu, China
      • Jiangsu Provincial Center for Disease Control and Prevention (Jiangsu Provincial Academy of Preventive Medicine)

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Child
• Accepts Healthy Volunteers: Yes

Description

Inclusion Criteria:

1. Healthy volunteers who are aged 2-17 years;
2. Participants and their guardians provide legal proof of identity, as well as vaccination record (for children aged 2-5 years);
3. Participants' guardians understand and voluntarily sign the informed consent form; participants aged 8-17 years sign the written assent;
4. Participants can follow all study procedures and stay in contact during the study.

Exclusion Criteria:

1. Received any pneumococcal vaccine prior to enrollment;
2. History of invasive pneumococcal diseases (IPDs) or other pneumococcal diseases caused by Streptococcus pneumoniae, as confirmed by laboratory tests;
3. History of allergy or adverse reactions to the vaccine or vaccine components, or history of allergy, such as urticaria, dyspnea, angioedema and anaphylactic shock;
4. Congenital malformations or developmental disorders, genetic defects (such as Down syndrome, thalassemia, or G6PD deficiency), severe malnutrition;
5. Have uncontrolled chronic diseases or history of severe diseases, including but not limited to cardiovascular diseases, such as cardiovascular diseases (e.g. congenital heart disease), metabolic diseases (such as diabetes), hematological diseases (e.g. severe anemia),liver and kidney diseases, digestive diseases, respiratory diseases (such as active tuberculosis), malignant tumors and major functional organ transplantation history;
6. Autoimmune diseases or immunodeficiency diseases (including but not limited to systemic lupus erythematosus, rheumatoid arthritis, autoimmune thyroid disease, asplenia, functional asplenia, HIV infection)
7. Diagnosed abnormal blood coagulation function (eg, lack of blood coagulation factors, blood coagulopathy, abnormal platelets level), history of obvious bleeding, hematoma or bruising after intramuscular injection or venipuncture.
8. Have/have suffered from a serious neurological disorder (epilepsy or convulsions) or mental illness or have a family history of such diseases.
9. Long-term alcohol or drug abuse.
10. Have received > 14 days of immunosuppressive or other immunomodulatory therapy in the past 6 months, or cytotoxic therapy, or plan to receive such therapy during the study period.
11. Received immunoglobulin or other blood products within 3 months prior to enrollment, or plan to receive such treatment during the study period;
12. Received other investigational drugs or vaccines within 30 days prior to enrollment, or plan to receive such drugs or vaccines during the study;
13. Received live attenuated vaccine within 14 days prior to enrollment;
14. Received subunit or inactivated or other vaccine within 7 days prior to enrollment;
15. Acute diseases or acute onset of chronic diseases within 7 days prior to enrollment, or known or suspected active infection;
16. Women who are pregnant or breastfeeding (if applicable);
17. Abnormalities in clinical laboratory indicators that exceed reference range and are clinically significant.
18. Had fever (axillary temperature> 37.0℃) before vaccination;
19. In the investigator's judgment, the participant has any other factors that make him or her unfit to participate in the clinical trial.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Prevention
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Quadruple

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Experimental group 1; 12 participants aged 6-17 years and 30 participants aged 2-5 years will be randomized to receive Sinovac PCV24 formulation 1. Route of administration is intramuscular injection at deltoid muscle of upper arm. Immunization schedule is 1 dose.	Biological: Sinovac PCV24 formulation 1; One dose of Sinovac PCV24 formulation 1(0.5mL)
Experimental: Experimental group 2; 12 participants aged 6-17 years and 30 participants aged 2-5 years will be randomized to receive Sinovac PCV24 formulation 2. Route of administration is intramuscular injection at deltoid muscle of upper arm. Immunization schedule is 1 dose.	Biological: Sinovac PCV24 formulation 2; One dose of Sinovac PCV24 formulation 2(0.5mL)
Active Comparator: Active control group; 30 participants aged 2-5 years will be randomized to receive Prevenar13®. Route of administration is intramuscular injection at deltoid muscle of upper arm. Immunization schedule is 1 dose.	Biological: Prevenar13®; One dose of PCV13 manufactured by Pfizer

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of adverse reactions	Incidence of adverse reactions within 30 days after vaccination	0-30 days after vaccination

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of adverse reactions	Incidence of adverse reactions within 7 days after vaccination	0-7 days after vaccination
Incidence of serious adverse events (SAE)	Incidence of SAE during the period of safety monitoring	0-6 months after vaccination
Incidence of clinically significant abnormality in laboratory examination tests	Incidence of clinically significant abnormality in blood routine, blood biochemistry and urine routine test results within 3 days after vaccination	0-3 days after vaccination
Pneumococcal serotype-specific IgG antibody geometric mean concentration (GMC)	IgG GMC 30 days after vaccination	30 days after vaccination
Pneumococcal serotype-specific IgG antibody geometric mean increase (GMI)	IgG GMI 30 days after vaccination	30 days after vaccination
Proportion of pneumococcal serotype-specific IgG antibody concentration increase≥4	Proportion of IgG antibody concentration increase≥four folds 30 days after vaccination	30 days after vaccination
Pneumococcal serotype-specific opsonophagocytic assay (OPA) geometric mean titer (GMTs)	OPA GMT 30 days after vaccination	30 days after vaccination
Pneumococcal serotype-specific OPA GMI	OPA GMI 30 days after vaccination	30 days after vaccination
Proportion of pneumococcal serotype-specific OPA antibody titer increase≥4	Proportion of OPA antibody titer increase≥four folds 30 days after vaccination	30 days after vaccination
Proportion of Pneumococcal serotype-specific IgG antibody concentration ≥0.35 μg/ml (seropositive rate)	Proportion of IgG antibody concentration ≥0.35 μg/ml	30 days after vaccination
Proportion of Pneumococcal serotype-specific IgG antibody concentration ≥1.0 μg/ml	Proportion of IgG antibody concentration ≥1.0 μg/ml	30 days after vaccination
Proportion of Pneumococcal serotype-specific OPA GMT≥1:8	Proportion of Pneumococcal serotype-specific OPA GMT≥1:8 30 days after vaccination	30 days after vaccination

Collaborators and Investigators

• Sponsor: Sinovac Life Sciences Co., Ltd.
• Investigators: Principal Investigator: Kai Chu, Jiangsu Provincial Center for Disease Control and Prevention (Jiangsu Provincial Academy of Preventive Medicine)

Study record dates

Study Major Dates

• Study Start (Actual): September 7, 2024
• Primary Completion (Actual): June 25, 2025
• Study Completion (Actual): June 25, 2025

Study Registration Dates

• First Submitted: August 8, 2024
• First Submitted That Met QC Criteria: August 8, 2024
• First Posted (Actual): August 13, 2024

Study Record Updates

• Last Update Posted (Actual): January 28, 2026
• Last Update Submitted That Met QC Criteria: January 26, 2026
• Last Verified: January 1, 2026

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Infections; Gram-Positive Bacterial Infections; Bacterial Infections; Bacterial Infections and Mycoses; Streptococcal Infections; Pneumococcal Infections; Immunologic Factors; Physiological Effects of Drugs; 13-valent pneumococcal vaccine
• Other Study ID Numbers: PRO-PCV24-1002

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No