Phase I/II Clinical Trial of 26-valent Pneumococcal Conjugate Vaccine

Axillary body temperature ≥ 37.3 ℃ on the day of enrollment;

History of infectious diseases caused by Streptococcus pneumoniae confirmed by bacterial culture within 3 years;

Have received or plan to receive a Streptococcus pneumoniae vaccine outside the trial protocol, including marketed or other investigational Streptococcus pneumoniae vaccines;

Pregnant or lactating women; Previous history of severe allergy to any vaccine or drug, such as urticaria, dyspnea, angioneurotic edema, anaphylactic shock, Henoch-Schonlein purpura, thrombocytopenic purpura;

Allergic to any component of the investigational vaccine;

Suffering from severe respiratory diseases (such as severe asthma), heart diseases, liver diseases, kidney diseases, congenital malformations, developmental disorders and genetic defects (including but not limited to: down syndrome, thalassemia major, etc.) that may interfere with the conduct or completion of the trial;

Diagnosed with congenital or acquired immunodeficiency, or suspected to have serious chronic disease or systemic disease that may interfere with the conduct or completion of the trial, such as: active tuberculosis, human immunodeficiency virus (HIV) infection, etc.;

Encephalopathy, uncontrolled epilepsy, convulsion and other progressive neurological diseases, or a history or family history of mental illness;

Contraindications for intramuscular injection such as thrombocytopenia, any coagulation disorder or receiving anticoagulant therapy;

Asplenia or splenectomy, functional asplenia due to any condition;

Immunosuppressant therapy, cytotoxic therapy or corticosteroid therapy within 3 months prior to vaccination, such as systemic glucocorticoid therapy for more than 2 consecutive weeks, such as prednisone or similar drugs > 5 mg/day (excluding corticosteroid spray therapy for allergic rhinitis, surface corticosteroid therapy for acute non-complicated dermatitis);

Received blood products or immunoglobulins within 3 months prior to enrollment (hepatitis B immunoglobulin is acceptable), or planned to be used during the trial (before the last immunogenicity blood sample collection);

Within 3 days before the first dose of vaccine, the patient has acute illness or is in acute attack of chronic disease, or has used antipyretic, analgesic or anti-allergic drugs (such as: acetaminophen, ibuprofen, aspirin, etc.);

Received non-live vaccine within 7 days (≤ 7 days) or live attenuated vaccine within 14 days (≤ 14 days) prior to enrollment;

Hypertension (systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg, applicable to adults);

Abnormal and clinically significant laboratory test results, which are not suitable for enrollment as determined by the investigator (applicable to subjects aged 2 years and older in Phase I);

Birth weight < 2.5 kg, premature delivery (gestational age < 37 weeks), history of abnormal labor process, history of asphyxia rescue, history of nerve organ damage, history of pathological jaundice confirmed by diagnosis;

For Standardised Subjects:

① Alanine aminotransferase (ALT) or aspartate aminotransferase (AST) ≥ 50 U/L; Or hemoglobin ≤ 115 g/L (female)/120g/L (male); Any positive serology for hepatitis B, hepatitis C, HIV, or syphilis.

Plans to move before the end of the trial or leave the area for an extended period of time during scheduled trial visits;

Ongoing participation or planning to participate in other clinical trials (vaccines, drugs, medical devices, etc.) in the near future;

Subject has any condition that, in the opinion of the investigator, may interfere with the evaluation of the objectives of the trial.