Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Feb 26;22(1):72.
doi: 10.1186/s12931-021-01635-w.

Chronic infection with Chlamydia pneumoniae in asthma: a type-2 low infection related phenotype

Doriane Calmes  1 , Pascale Huynen  2 , Virginie Paulus  1 , Monique Henket  1 , Françoise Guissard  1 , Catherine Moermans  1 , Renaud Louis  1 , Florence Schleich  3
Affiliations

Chronic infection with Chlamydia pneumoniae in asthma: a type-2 low infection related phenotype

Doriane Calmes et al. Respir Res. .

Abstract

Background: Chlamydia pneumoniae and Mycoplasma pneumoniae have been implicated in the pathogenesis of asthma and are responsible for chronic inflammation when host immune system fails to eradicate the bacteria.

Method: We performed a prospective study on 410 patients who underwent a visit at the asthma clinic of CHU of Liege between June 2016 and June 2018 with serology testing for C. pneumoniae and M. pneumoniae.

Results: 65% of our asthmatic population had serum IgA and/or IgG towards C. pneumoniae, while only 12.6% had IgM and/or IgG against M. pneumoniae. Compared to seronegative asthmatics, asthmatics with IgA+ and IgG+ against C. pneumoniae were more often male and older with a higher proportion of patients with smoking history. They received higher doses of inhaled corticosteroids (ICS) and displayed lower FEV1/FVC ratio, higher RV/TLC ratio and lower conductance. They had higher levels of fibrinogen, though in the normal range and had lower sputum eosinophil counts. Patients with IgA- and IgG+ against C. pneumoniae were older and had higher blood monocyte counts and alpha-1-antitrypsin levels as compared to seronegative patients. Patients with IgM and/or IgG towards M. pneumoniae were more often males than seronegative asthmatics. In a subpopulation of 14 neutrophilic asthmatics with Chlamydia pneumoniae IgA + /IgG + treated with macrolides, we found a significant decrease in blood neutrophils and normalization of sputum neutrophil count but no effect on asthma quality of life and exacerbations.

Conclusion: Positive Chlamydia serologic test is more common than positive Mycoplasma serology. Asthmatics with IgA and IgG against C. pneumoniae have more severe disease with increased airway obstruction, higher doses of ICS, more signs of air trapping and less type-2 inflammation.

Keywords: Asthma; Chlamydia pneumoniae; Macrolides; Neutrophils; Phenotypes; Sputum.

PubMed Disclaimer

Conflict of interest statement

The authors declare that they have no competing interests related to this manuscript. Renaud Louis received grants from GSK, Astrazeneca, Novartis and Chiesi and personal fees from GSK, Astrazeneca and Novartis. Florence Schleich received grants from GSK and Astrazeneca and personal fees from GSK and Chiesi. Other co-authors have nothing to declare.

Figures

Fig. 1
Fig. 1
Prevalence of positive IgA/IgG against Chlamydia pneumoniae (upper panel) and IgM/IgG against Mycoplasma pneumoniae (lower panel)
Fig. 2
Fig. 2
Comparison of patients with Chlamydia pneumoniae IgA−/IgG−, IgA−/IgG + and IgA + /IgG + sero-status. Group 0: Chlamydia pneumoniae IgA−/IgG−. Group 1: Chlamydia pneumoniae IgA−/IgG + . Group 2: Chlamydia pneumoniae IgA + /IgG +
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

See all "Cited by" articles

References

    1. Huang YJ, Boushey HA. The microbiome in asthma. J Allergy Clin Immunol. 2015;135(1):25–30. doi: 10.1016/j.jaci.2014.11.011. - DOI - PMC - PubMed
    1. Hahn DL. Infectious asthma: a reemerging clinical entity? J Fam Pract. 1995;41(2):153–157. - PubMed
    1. Rantala A, Jaakkola JJK, Jaakkola MS. Respiratory infections precede adult-onset asthma. PLoS ONE. 2011;6(12):e27912. doi: 10.1371/journal.pone.0027912. - DOI - PMC - PubMed
    1. Webley WC, Hahn DL. Infection-mediated asthma: Etiology, mechanisms and treatment options, with focus on Chlamydia pneumoniae and macrolides. Respir Res. 2017;18(1):98. doi: 10.1186/s12931-017-0584-z. - DOI - PMC - PubMed
    1. Yeh JJ, Wang YC, Hsu WH, Kao CH. Incident asthma and Mycoplasma pneumoniae: a nationwide cohort study. J Allergy Clin Immunol. 2016;137(4):1017–1023. doi: 10.1016/j.jaci.2015.09.032. - DOI - PubMed

MeSH terms