Phase 2 Trial to Evaluate Safety and Immunogenicity of Inventprise's (IVT) 25-valent Pneumococcal Conjugate Vaccine (IVT PCV-25) in Healthy Infants

Inclusion Criteria: Participants who meet all the following criteria may be included in the study:

1. Age 42 to 56 days, inclusive, at the time of Dose 1

2. Good general health status, as determined by medical history, physical examination,vital signs, and clinical judgment

3. Product of normal full-term pregnancy (37 to 42 weeks' gestation)

4. Birth weight ≥ 2000 g

5. Length and weight ≥ -2 standard deviations (SD) for age and sex, according to thePhilippine national child growth standards (see Appendix 1)

6. Willingness of parent/guardian for the child to attend all protocol visits and tohave all protocol-required procedures

7. Provision of written informed consent by legally acceptable representative

Exclusion Criteria: Participants who meet any of the following criteria will be excluded from the study:

1. Congenital abnormality or serious chronic disorder requiring treatment or likely toaffect normal growth or development

2. Any condition that may increase risk of study participation or interfere withinterpretation of study results

3. Immunodeficiency or chronic administration (> 14 consecutive days) ofimmunosuppressant or other immune-modifying drugs (see details in Section 6.6.2),including systemic glucocorticoids, within 6 months before Day 1 (topical, intra-articular, or inhaled glucocorticoids permitted)

4. History of sepsis or pneumonia

5. History of anaphylaxis or angioedema

6. History of severe reaction to immunization

7. Known hypersensitivity to any of the ingredients in either IVT PCV-25 or Prevnar 20

8. Contraindication to any concomitant vaccine or to Prevnar 20, according to eachvaccine's product information

9. Prior receipt of a licensed or investigational pneumococcal vaccine

10. Prior receipt of any diphtheria, tetanus, pertussis, Hib, or polio vaccine

11. Prior receipt of > 1 dose of HepB vaccine

12. Receipt of HepB vaccine at age ≥ 30 days

13. Receipt of an inactivated vaccine within 14 days before Day 1 or planned receiptthrough Day 85 other than as described in Section 6.6.1 and Section 6.6.3

14. Receipt of a live vaccine within 28 days before Day 1 or planned receipt through Day 85 other than as described in Section 6.6.1 and Section 6.6.3

15. Receipt of blood transfusion or blood products before Day 1 or planned receiptthrough Day 85

16. Receipt of any other IP before Day 1

17. Planned elective hospitalization or surgical procedure through the end of the study

18. Family member of employee of Inventprise, vendors, or research sites associated withthe study

19. Any medical, psychiatric, or social condition, or occupational or otherresponsibility of the parent/guardian that, in the judgment of the Investigator,would interfere with or serve as a contraindication to protocol adherence,assessment of safety (including reactogenicity), or an ability to provide informedconsent

Temporary Delay Criteria: administration of IVT PCV-25 / Prevnar20 will be delayed for any participant who meets any of the following criteria:

1. Receipt of any inactivated vaccine within 14 days or any live vaccine within 28 days

2. Febrile illness (eg, temperature ≥ 38.0°C) or other acute illness within 48 hours

3. Any other signs or symptoms or medication use that could inhibit the proper vaccineadministration of the IP or interpretation of diary data