The purpose of this study is to learn about how well the Prevnar 20 vaccine (PCV20) stops invasive pneumococcal disease (a group of severe infections caused by a bacteria called Streptococcus pneumoniae), pneumococcal pneumonia (a bacterial lung disease caused by the germ Streptococcus pneumoniae), all-cause pneumonia (pneumonia caused by any germ including bacteria, a virus, or a fungus), and lower respiratory tract infection (infection of the lower airways in the lung) in people 65 years and older. This study will use a database of people who have Medicare insurance with names and other identifying information removed. This study will include people who: * are 65 years and older, * live in one of the 50 United States or Washington DC, and * are enrolled in Medicare Fee-for-Service Parts A and B for at least 1 year. The study uses data that is already being collected and no treatment or vaccine will be given in the study. People that fit the description above will be followed in the Medicare database for about two years. Their information will be reviewed to see if they had vaccines for pneumonia or had certain health events, such as pneumonia or lower respiratory tract infection. The experiences of people that received Prevnar 20 will be compared to the experiences of people that did not receive the vaccine. This will help to show how well Prevnar 20 works at stopping invasive pneumococcal disease, pneumococcal pneumonia, all-cause pneumonia, and lower respiratory tract infection.
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Weighted PCV20 vaccine effectiveness (VE) against Invasive Pneumococcal Disease (IPD)
Timeframe: Time to pneumococcal vaccination, disenrollment from Medicare FFS Parts A or B, enrollment in Medicare Part C, death, or IPD up to 24 months
Weighted PCV20 VE against Pneumococcal Pneumonia (PP)
Timeframe: Time to pneumococcal vaccination, disenrollment from Medicare FFS Parts A or B, enrollment in Medicare Part C, death, or PP up to 24 months
Absolute difference in the incidence of PP by PCV20 vaccination status
Timeframe: Time to pneumococcal vaccination, disenrollment from Medicare FFS Parts A or B, enrollment in Medicare Part C, death, or PP up to 24 months
Weighted PCV20 VE against all cause pneumonia (ACP)
Timeframe: Time to pneumococcal vaccination, disenrollment from Medicare FFS Parts A or B, enrollment in Medicare Part C, death, or ACP up to 24 months
Absolute difference in incidence of ACP by PCV20 vaccination status
Timeframe: Time to pneumococcal vaccination, disenrollment from Medicare FFS Parts A or B, enrollment in Medicare Part C, death, or ACP up to 24 months
Absolute difference in the incidence of IPD by PCV20 vaccination status
Timeframe: Time to pneumococcal vaccination, disenrollment from Medicare FFS Parts A or B, enrollment in Medicare Part C, death, or IPD up to 24 months