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. 1998 Apr;53(4):254–259. doi: 10.1136/thx.53.4.254

Chlamydia pneumoniae and asthma

P Cook 1, P Davies 1, W Tunnicliffe 1, J Ayres 1, D Honeybourne 1, R Wise 1
PMCID: PMC1745183  PMID: 9741366

Abstract

BACKGROUND—This study was designed to test the association of Chlamydia pneumoniae infection with asthma in a multiracial population, after adjustments for several potential confounding variables.
METHODS—Antibodies to C pneumoniae were measured by microimmunofluorescence in 123 patients with acute asthma, 1518 control subjects admitted to the same hospital with various non-cardiovascular, non-pulmonary disorders, and 46 patients with severe chronic asthma, including some with "brittle" asthma. Acute infection or reinfection was defined by titres of IgG of ⩾512 or IgM ⩾8 or a fourfold rise in IgG, and previous infection by IgG 64-256 or IgA ⩾8. Logistic regression was used to control for likely confounders, including ethnic origin, age, sex, smoking habit, steroid medication, diabetes mellitus and social deprivation, on antibody levels.
RESULTS—Antibody titres consistent with acute C pneumoniae infection were found in 5.7% of patients with acute asthma and 5.7% of control patients, while 14.6% of patients with acute asthma and 12.7% of control patients had titres suggesting previous infection. These two groups did not differ significantly. However, titres suggesting previous infection were found in 34.8% of patients with severe chronic asthma: the difference between this group and the control group was statistically significant with an adjusted odds ratio of 3.99 (95% confidence interval 1.60 to 9.97).
CONCLUSIONS—These data raise important questions about the previously demonstrated association of C pneumoniae infection with asthma, and suggest that future studies of this association should give particular attention to the presence or absence of a history of severe chronic asthma.



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Selected References

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