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Not yet recruiting NCT07679789

Community-acquired Pneumonia Due to Chlamydia Pneumoniae

— Observational Community-Acquired Pneumonia

For patients and families

In plain language

An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.

What is being studied
This is an observational study: the protocol does not assign a study treatment.
Who it may be relevant to
Registry conditions: Community-Acquired Pneumonia. Basic parameters: No limits · All.
What needs checking
Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
Where it takes place
France
Next step
Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →

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Official title

Prevalence and Phenotyping of Chlamydia Pneumoniae Infections Among Pnuemonias Tested With Simplex and Multiplex PCR

Overview

This international retrospective Franco-Swiss study focuses on community-acquired pneumonia (CAP) caused by Chlamydia pneumoniae. The working hypothesis is that the prevalence of C. pneumoniae pneumonia is overestimated by the medical community. The primary objective is to determine the true prevalence of C. pneumoniae infections among patients with pneumonia who underwent simplex or multiplex PCR testing. Secondary objectives include; 1. Outpatient management 2. Hospitalization in a medical ward 3. Admission to the intensive care unit 4. In-hospital mortality 5. Radiological presentation of patients with community-acquired pneumonia (CAP) caused by Chlamydia pneumoniae 6. Prevalence of viral or bacterial co-infections associated with C. pneumoniae CAP

Detailed description

This international retrospective Franco-Swiss study focuses on community-acquired pneumonia (CAP) caused by Chlamydia pneumoniae. The working hypothesis is that the prevalence of C. pneumoniae pneumonia is overestimated by the medical community. The primary objective is to determine the true prevalence of C. pneumoniae infections among patients with pneumonia who underwent simplex or multiplex PCR testing. Secondary objectives include;1)Outpatient management2)Hospitalization in a medical ward3)Admission to the intensive care unit4) In-hospital mortality5) Radiological presentation of patients with community-acquired pneumonia (CAP) caused by Chlamydia pneumoniae 6)Prevalence of viral or bacterial co-infections associated with C. pneumoniae CAP

Detailed Description We have all learned and continue to teach that community-acquired pneumonia (CAP) is essentially represented by three bacteria: Legionella pneumophila, Mycoplasma pneumoniae, and Chlamydia pneumoniae. While the recent Mycoplasma outbreak in France and the prevalence of severe Legionella infections in intensive care units confirm the real impact of these pathogens in CAP, the low number of Chlamydia pneumoniae cases documented by PCR raises questions.Over the past twenty years, the development of highly sensitive molecular tests (specific PCR or multiplex PCR targeting intracellular respiratory pathogens) has made it possible to precisely detect Chlamydia pneumoniae and to confirm or rule out its presence in the respiratory tract of patients with pneumonia.We are therefore conducting a retrospective study between France and Switzerland to determine, on the one hand, the number of CAP cases due to Chlamydia pneumoniae confirmed by PCR, and on the other hand, to better characterize the phenotype of these patients.

Primary outcome measures

  • Prevalence of Chlamydia pneumoniae Among Pneumonia Cases Tested by PCR [Time frame: January 2015 to December 2025]
Secondary outcome measures (5)
  • Clinical Severity of Chlamydia pneumoniae Pneumonia [Time frame: From hospital admission through hospital discharge (up to 90 days)]
  • Radiological Characteristics [Time frame: Baseline (at the time of pneumonia diagnosis)]
  • Viral Co-Infection Rate [Time frame: Baseline (at the time of PCR testing)]
  • Bacterial Co-Infection Rate [Time frame: Baseline (at the time of PCR testing)]
  • Length of Hospital Stay [Time frame: From hospital admission through hospital discharge (up to 90 days)]

Eligibility criteria

Inclusion criteria

  • Positive simplex or multiplex PCR for Chlamydia pneumoniae on an upper or lower respiratory tract specimen between January 2015 and December 2025.
  • Availability of clinical data allowing confirmation of pneumonia diagnosis.

Exclusion criteria

  • Patient opposition to the use of medical data for research purposes.
  • Absence of pneumonia diagnosis.
  • Insufficient clinical data for analysis.

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Observational model
Other

Study locations

France · 1 center
  • Centre Hospitalier de Saint-Denis — Saint-Denis

Publications

  • Garin N, Hugli O, Genne D, Greub G. Lack of Chlamydia-related bacteria among patients with community-acquired pneumonia. New Microbes New Infect. 2015 Oct 22;8:164-5. doi: 10.1016/j.nmni.2015.10.002. eCollection 2015 Nov. No abstract available. PMID 27257497
  • Garin N, Marti C, Skali Lami A, Prendki V. Atypical Pathogens in Adult Community-Acquired Pneumonia and Implications for Empiric Antibiotic Treatment: A Narrative Review. Microorganisms. 2022 Nov 24;10(12):2326. doi: 10.3390/microorganisms10122326. PMID 36557579
  • Miyashita N. Atypical pneumonia: Pathophysiology, diagnosis, and treatment. Respir Investig. 2022 Jan;60(1):56-67. doi: 10.1016/j.resinv.2021.09.009. Epub 2021 Nov 5. PMID 34750083
  • Cunha BA. The atypical pneumonias: clinical diagnosis and importance. Clin Microbiol Infect. 2006 May;12 Suppl 3:12-24. doi: 10.1111/j.1469-0691.2006.01393.x. PMID 16669925

Identifiers

NCT: NCT07679789 · 0079_MIR_CHLAMPAC

Primary sources (government registries)

View this study on ClinicalTrials.gov ↗