Definition and research guide
This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.
Content available: 3 complete abstracts (928 words), 9 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.
Definition
Infection of the lungs in a patient who is not hospitalized or who has not resided in a long-term care facility for 14 days prior to the onset of symptoms. It is associated with some signs and symptoms of acute infection and is accompanied by the presence of an acute infiltrate on chest radiograph.(US Pharm. 2007;32(10):44-5 https://www.uspharmacist.com/article/community-acquired-pneumonia)
Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.
Also known as: Community Acquired Pneumonia; Community-Acquired Pneumonias; Pneumonia, Community-Acquired; Pneumonias, Community-Acquired.
Where it fits in the MeSH classification
- Broader topics
- Community-Acquired Infections; Pneumonia
Research landscape
PubMed indexes 664 records tagged with the MeSH heading “Community-Acquired Pneumonia” (counts retrieved 2026-10-29). 664 of them (100.0%) were published from 2020 onward, and the busiest period so far is 2020 onward with 664 records.
Reviews account for 111 records (16.7%) and meta-analyses for 30. Randomized controlled trials number 29 (4.4%) as a share of all records on the topic.
Show the data
| Period | Records |
|---|---|
| through 1999 | 0 |
| 2000-2009 | 0 |
| 2010-2019 | 0 |
| 2020 onward | 664 |
Publication-type chart data
| Type | Records | Share |
|---|---|---|
| Reviews | 111 | 16.7% |
| Meta-analyses | 30 | 4.5% |
| Randomized controlled trials | 29 | 4.4% |
Method: PubMed query "Community-Acquired Pneumonia"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.
Reading the evidence in infectious diseases
Infectious disease evidence combines microbiology, epidemiology and clinical trials. Laboratory studies identify pathogens and how they cause harm; surveillance and outbreak investigations describe who is affected and how infection spreads; trials establish whether treatments and vaccines work. Results depend on place and time, because pathogens evolve and resistance patterns and population immunity change. Check when and where the data were collected, how cases were defined and how up to date the evidence is.
Evidence from open-access studies
These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.
| Study / authors | Year | Source label / design | Europe PMC citations | Licence / source |
|---|---|---|---|---|
| A Pragmatic Trial of Glucocorticoids for Community-Acquired Pneumonia | 2025 | Randomized controlled trial Design not recorded in structured metadata | 14 | cc by PMID 41159889 · DOI · PMC12659994 |
| Changing patterns of respiratory pathogens in hospitalized children with community-acquired pneumonia in northern China following the lifting of non-pharmaceutical interventions | 2025 | Research article Design not recorded in structured metadata | 7 | cc by PMID 40990493 · DOI · PMC12584751 |
| Endothelial glycocalyx degradation and its association with clinical outcomes and host response aberrations in community-acquired pneumonia across different care settings | 2026 | Research article Design not recorded in structured metadata | 4 | cc by PMID 41593637 · DOI · PMC12874961 |
A Pragmatic Trial of Glucocorticoids for Community-Acquired Pneumonia [1]
Abstract reading summary — source excerpts
- Opening excerpt
- BackgroundAdjunctive glucocorticoids may reduce mortality among patients with severe community-acquired pneumonia (CAP) in well-resourced settings.
- Closing excerpt
- ).
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (236 words)
BackgroundAdjunctive glucocorticoids may reduce mortality among patients with severe community-acquired pneumonia (CAP) in well-resourced settings. Whether these drugs are beneficial in low-resource settings with limited diagnostic and treatment facilities is unclear.MethodsIn this pragmatic, open-label, randomized, controlled trial conducted in 18 public hospitals in Kenya, we assigned adult patients who had received a diagnosis of CAP and who did not have a clear indication for glucocorticoids to receive either standard care for CAP or oral low-dose glucocorticoids for 10 days in addition to standard care. The primary outcome was death from any cause at 30 days after enrollment.ResultsA total of 2180 patients underwent randomization (1089 assigned to the glucocorticoid group and 1091 to the standard-care group). The median age of the patients was 53 years (interquartile range, 38 to 72); 46% were women. At day 30, deaths were reported in 530 patients (24.3%): 246 patients (22.6%) in the glucocorticoid group and 284 patients (26.0%) in the standard-care group (hazard ratio, 0.84; 95% confidence interval, 0.73 to 0.97; P = 0.02). The frequencies of adverse events and serious adverse events were similar in the two trial groups. Serious adverse events that were considered to be related to glucocorticoid administration occurred in 5 patients (0.5%).ConclusionsIn patients with CAP in a low-resource setting, adjunctive glucocorticoid therapy was associated with a lower risk of death than standard care. (Funded by Wellcome Trust and others; SONIA PACTR number, PACTR202111481740832; ISRCTN number, ISRCTN36138594.).
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41159889 · DOI · PMC12659994
Changing patterns of respiratory pathogens in hospitalized children with community-acquired pneumonia in northern China following the lifting of non-pharmaceutical interventions [2]
Abstract reading summary — source excerpts
- Opening excerpt
- An observational, single-center study was conducted among hospitalized children with community-acquired pneumonia in the Baoding area.
- Closing excerpt
- This research underscores the urgent need to adapt clinical management and public health policies to address the changing infection trends, highlighting their importance and innovation in understanding the impact of NPIs on pediatric respiratory infections.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (375 words)
An observational, single-center study was conducted among hospitalized children with community-acquired pneumonia in the Baoding area. The objective was to compare the respiratory pathogen profiles and epidemiological patterns during and after the lifting of non-pharmaceutical interventions (NPIs, including mask-wearing, social distancing, lockdowns, etc.). A total of 9,362 hospitalized children diagnosed with CAP in Baoding from January 2022 to December 2023 were included. Both viral and bacterial pathogens were detected by multiplex PCR. The NPIs were lifted in Baoding from 2 December 2022. A comparative analysis was conducted on demographic data, epidemiological data, pathogen detection rates, and co-infection patterns that were compared between the full year 2022 and 2023. The detection rate of at least one pathogen significantly increased from 74.2% (2,925/3,940) in 2022 to 86.5% (4,690/5,422) in 2023 (P Mycoplasma pneumoniae, Streptococcus pneumoniae, human rhinovirus, respiratory syncytial virus (RSV), and Haemophilus influenzae were the predominant pathogens. Notably, co-infection rates rose from 25.1% (988/3,940) in 2022 to 45.1% (2,445/5,422) in 2023 (P < 0.001), particularly viral-bacterial co-infections. The positive detection rates for many pathogens among severe pneumonia cases increased. Additionally, an age shift in infection patterns was observed, with older children showing a higher prevalence of RSV. Following the lifting of NPIs, an increase in the detection rates of pathogens was observed, as were fluctuations in the dynamics of viral and bacterial pathogens, underscoring the urgent need to adapt clinical management and public health policies to address emerging infection trends. IMPORTANCE Community-acquired pneumonia (CAP) remains the leading infectious cause of death in children worldwide. Understanding the pathogens responsible for CAP is essential for effective diagnosis and treatment. This study examines the changes in respiratory pathogens and epidemiological patterns in children with CAP in Baoding, China, before and after the lifting of non-pharmaceutical interventions (NPIs). Data from 9,362 children diagnosed with CAP from January 2022 to December 2023 were analyzed. The detection rate of at least one pathogen increased significantly from 74.2% in 2022 to 86.5% in 2023. Notably, co-infection rates rose from 25.1% to 45.1%, with viral-bacterial co-infections being more common. This research underscores the urgent need to adapt clinical management and public health policies to address the changing infection trends, highlighting their importance and innovation in understanding the impact of NPIs on pediatric respiratory infections.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 40990493 · DOI · PMC12584751
Endothelial glycocalyx degradation and its association with clinical outcomes and host response aberrations in community-acquired pneumonia across different care settings [3]
Abstract reading summary — source excerpts
- Opening excerpt
- BACKGROUND: Endothelial glycocalyx degradation has been implicated in the pathogenesis of sepsis.
- Closing excerpt
- Key systemic host response changes implicated in sepsis pathogenesis occur prior to detectable glycocalyx degradation in this population.
- Interpretation limits
- Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (317 words)
BACKGROUND: Endothelial glycocalyx degradation has been implicated in the pathogenesis of sepsis. Previous studies linked elevated plasma syndecan-1, an established biomarker of glycocalyx disruption, to mortality in sepsis. We aimed to determine the association of plasma syndecan-1 levels with clinical outcomes and host response changes in patients with community-acquired pneumonia (CAP) with various disease severities. METHODS: We included CAP patients upon presentation in three care settings: emergency department (ED), general ward, and intensive care unit (ICU). We stratified patients in a Normal-Syndecan-1 and an Elevated-Syndecan-1 group based on syndecan-1 levels measured in outpatient controls without infection, and measured 32 biomarkers reflective of five pathophysiological domains involved in sepsis immunopathology: coagulation activation, endothelial cell activation and dysfunction, cytokines, neutrophil degranulation, systemic inflammation and organ damage. We analyzed blood transcriptomes to obtain insight in changes in host response pathways in circulating leukocytes related with glycocalyx disruption. RESULTS: We included 50 non-infectious control patients and 384 CAP patients, with samples collected from 95 in the ED, 124 after admission to the general ward, and 165 after admission to the ICU. The Elevated-Syndecan-1 group showed significantly reduced 30-day survival compared to the Normal-Syndecan-1 group (log-rank p < 0.05). The relationship between syndecan-1 (continuous variable) and 30-day mortality was non-linear and independent of comorbidities and disease severity. Most biomarkers were already strongly elevated in the Normal-Syndecan-1 group relative to non-infectious controls, spanning all pathophysiological domains. All biomarkers showed further increases in the Elevated-Syndecan-1 group relative to non-infectious controls, which was also reflected in direct comparisons between the Normal-Syndecan-1 and Elevated-Syndecan-1 groups. Gene set enrichment analysis of blood leukocytes indicated a link between elevated syndecan-1 and increased expression of genes involved in extracellular matrix organization and hemostasis. CONCLUSIONS: Glycocalyx degradation, as measured by plasma syndecan-1, shows a non-linear association with mortality in patients with CAP. Key systemic host response changes implicated in sepsis pathogenesis occur prior to detectable glycocalyx degradation in this population.
Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41593637 · DOI · PMC12874961
Key reviews and meta-analyses
The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.
- Research article Community-acquired pneumonia [4]
- Research article Severe community-acquired pneumonia: current concepts and controversies [5]
- Research article The risk of cardiovascular, cerebrovascular and thromboembolic events after community-acquired pneumonia among adults: a systematic literature review [6]
- Research article Shorter Versus Longer Antibiotic Treatment in Children With Community-Acquired Pneumonia: A Systematic Review With Meta-Analyses [7]
- Research article Fulminant community-acquired pneumonia due to exoU-positive Pseudomonas aeruginosa sequence type 319: A case report and literature review [8]
- Research article Macrolides usage as anti-inflammatory agents in the treatment of community-acquired pneumonia and ventilator-associated pneumonia: a systematic review and meta-analysis [9]
References
- Lucinde RK, Gathuri H, Mwaniki P, Orindi B, Otieno EO, Mwakio S, et al.. A Pragmatic Trial of Glucocorticoids for Community-Acquired Pneumonia. . 2025. PMID 41159889 · DOI · PMC12659994
- Jiang T-t, Wang Z-m, Tang H, Sun L, Han Q, Qi H, et al.. Changing patterns of respiratory pathogens in hospitalized children with community-acquired pneumonia in northern China following the lifting of non-pharmaceutical interventions. . 2025. PMID 40990493 · DOI · PMC12584751
- Wang H, Michels EHA, Cai M, Butler JM, de Brabander J, Reijnders TDY, et al.. Endothelial glycocalyx degradation and its association with clinical outcomes and host response aberrations in community-acquired pneumonia across different care settings. . 2026. PMID 41593637 · DOI · PMC12874961
- Reyes LF, Conway Morris A, Serrano-Mayorga C, Derde LPG, Dickson RP, Martin-Loeches I. Community-acquired pneumonia. Lancet. 2025. PMID 41110447 · DOI
- Dequin PF, Torres A, Bassetti M, Ferrer M, Giamarellos-Bourboulis EJ, Martin-Loeches I, et al.. Severe community-acquired pneumonia: current concepts and controversies. Intensive Care Med. 2026. PMID 41524797 · DOI · PMC12852277
- Theilacker C, Guardado Escobar ME, Sato R, Carrió E, Basu S, Tran TMP, et al.. The risk of cardiovascular, cerebrovascular and thromboembolic events after community-acquired pneumonia among adults: a systematic literature review. Eur Respir Rev. 2025. PMID 41511415 · DOI · PMC11920887
- Benkendorff A, Puntscher S, Flatscher-Thöni M, Mühlberger N, Göhner A, Beck S, et al.. Shorter Versus Longer Antibiotic Treatment in Children With Community-Acquired Pneumonia: A Systematic Review With Meta-Analyses. Dtsch Arztebl Int. 2026. PMID 41572864 · DOI · PMC13340186
- Nishihara Y, Kurihara M, Okawa N, Muranaka E, Mito H, Uzawa N, et al.. Fulminant community-acquired pneumonia due to exoU-positive Pseudomonas aeruginosa sequence type 319: A case report and literature review. Diagn Microbiol Infect Dis. 2026. PMID 42190526 · DOI
- Nasr R, Rahman AA, ElHadi N, Salameh P, Mansour H. Macrolides usage as anti-inflammatory agents in the treatment of community-acquired pneumonia and ventilator-associated pneumonia: a systematic review and meta-analysis. Syst Rev. 2026. PMID 42087250 · DOI · PMC13312718
About this article
- Sources
- NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
- Verification
- Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
- Review state
- automated source verified; no human expert review has been recorded yet.
- Version
- 1, last updated 2026-10-29.
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