A Study to Learn How Effective is PCV20 to Help Stop Adults Who Have a Higher Chance of Getting Pneumonia

Exclusion Criteria

• •1. PCV15 received any time before or after the cohort entry date;
• •2. a diagnosis code in the electronic health record (EHR) for pneumonia or lower respiratory tract infection (LRTI) was made within 30 days prior to cohort entry;
• •3. Kaiser Permanente Southern California (KPSC) members with zero outpatient visits.