Prospective, observational, hospital based, nasopharyngeal carriage (NPC), vaccine effectiveness study Comparisons will be made in Filipino children, aged 8 weeks to ≤60 months of age at enrollment, who have been hospitalized with a radiologically-confirmed, community-acquired pneumonia (CAP).

This study will be the first of two phases (A and B). Phase A will compare a PCV13-vaccinated setting (SPMC) with an unvaccinated setting (PCMC)

Inclusion Criteria:

1. Child 8 weeks to ≤60 months of age
2. Resident of the National Capital Region (NCR) or Region X-XIII
3. Child admitted with a medical diagnosis of clinical CAP based on history and physical exam
4. Written informed consent obtained from a parent or legal guardian
5. At SPMC site, child must have received at least 1 dose of PCV13 given at <12 months based on history-taking
6. For Phase B at PCMC site, child must have received at least 1 dose of PCV13 given at <12 months based on history-taking

Exclusion Criteria:

1. Children with a known primary or secondary immunodeficiency
2. Child with a contraindication to doing a nasopharyngeal swab which may include, but is not limited to: dyscrasias, coagulation disorders, or other diseases (e.g., hemophilia, purpura), presence of craniofacial abnormalities32
3. For Phase A at PCMC site, child with any PCV in the past based on history-taking

Children 8 weeks to ≤60 months of age from the National Capital Region (NCR) or Region X-XIII admitted with a medical diagnosis of clinical community-acquired pneumonia (CAP), confirmed by an abnormal chest x-ray. In Region X-XIII, the child must have received at least 1 dose of PCV13 given at <12 months.