New pneumonia vaccine shows promise in early trial

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Healthy infants aged 2 months (minimum 6 weeks), healthy infants aged 3 months, healthy infants aged 7 \~ 11 months, healthy infants aged 12\~ 23 months, healthy children aged 2\~ 5 years, healthy adolescent and children aged 6\~ 17 years, healthy adults aged 18\~ 49 years； * Proven legal identification and vaccination certificate (vaccination certificate is required for those aged 5 and below)； * The subject and/or guardian can understand and voluntarily sign the informed consent form. Exclusion Criteria: * Have received pneumococcal polysaccharide vaccine or pneumococcal polysaccharide conjugate vaccine; * Have Bacterial pneumonia or invasive pneumococcal infectious disease (IPD) caused by pneumococcus confirmed by sputum culture; * History of asthma, history of allergy to the vaccine or vaccine components, or serious adverse reactions to the vaccine, such as urticaria, dyspnea, and angioedema; * Congenital malformations or developmental disorders, genetic defects, severe malnutrition, etc.; * Autoimmune disease or immunodeficiency / immunosuppression; * Severe chronic diseases, severe cardiovascular diseases, hypertension and diabetes that cannot be controlled by drugs, liver or kidney diseases, malignant tumors, etc.; * Severe neurological disease (epilepsy, convulsions or convulsions) or mental illness; * History of thyroidectomy, absence of spleen, functional absence of spleen, and absence of spleen or splenectomy due to any circumstance; * Diagnosed abnormal blood coagulation function (eg, lack of blood coagulation factors, blood coagulopathy, abnormal platelets) or obvious bruising or blood coagulation; * Immunosuppressive therapy, cytotoxic therapy, inhaled corticosteroids (excluding allergic rhinitis corticosteroid spray therapy, acute noncomplicated dermatitis superficial corticosteroid therapy) in the past 6 months; * History of alcohol or drug abuse; * Receipt of blood products within in the past 3 months; * Receipt of other investigational drugs in the past 30 days; * Receipt of attenuated live vaccines in the past 14 days; * Receipt of inactivated or subunit vaccines in the past 7 days; * Acute diseases or acute exacerbation of chronic diseases in the past 7 days; * Axillary temperature \>37.0°C; * According to the investigator's judgment, the subject has any other factors that are not suitable for participating in the clinical trial.