Community-acquired pneumonia is the most contagious illness cause of death. We summarize newly released findings regarding the etiology of Community-acquired pneumonia in adults, efficiency of injections versus Streptococcus pneumoniae, diagnostics, and review the current therapy options. The research for eligible articles as of June 2022 through PubMed, and Embase. We have used the following search MeSh terms for PubMed: (community acquired pneumonia), Treatment and diagnosis Community-acquired pneumonia is a significant cause of infectious illness mortality, with an increasing prevalence with age. With an aging population, CAP will undoubtedly remain a worldwide problem. Although Streptococcus pneumoniae is still the most commonly isolated infection in CAP, the relative incidence of other pathogens has increased. Comorbidities and other risk factors should trigger medical suspicion. Advances in immunization, such as the introduction of PCV and subsequent herd resistance, as well as the potential use of PCV in adults, should help minimize the amount of sickness caused by S. pneumoniae.