Chlamydia pneumoniae seropositivity and risk of ischemic stroke: (original) (raw)
Abstract
Chlamydia pneumoniae has been linked with increased risk of cardiovascular disease, but data on stroke are sparse. We examined whether seropositivity to Chlamydia pneumoniae was associated with the risk of ischemic stroke in a nested case–control study. Data on Chlamydia pneumoniae serology, lifestyle factors, and medical history were obtained at baseline. Verified cases (n = 254) were compared with gender- and age-matched controls (n = 254). Positive IgA (≥ 1:16) or IgG (≥ 1:64) titers were associated with an increased risk of acute ischemic stroke, i.e. adjusted odds ratios (ORs) were 1.54 (95% confidence interval, CI: 0.96–2.47) and 1.28 (95% CI: 0.83–1.95). The adjusted OR was 1.77 (95% CI: 1.04–3.00) when both titers were elevated. The highest point estimates were seen for ischemic stroke due to large-artery atherosclerosis, adjusted OR: 6.32 (95% CI: 0.76–52.61) (IgG (≥ 1:64)). No clear associations were found for other types of ischemic stroke. The strength of the association varied depending on gender and the chosen cut-off values for the antibody titers. These results partly support the hypothesis that serologic evidence of Chlamydia pneumoniae infection may be associated with an increased risk of ischemic stroke. However, the risk may differ according to gender, subtype of ischemic stroke, and cut-off value of antibody titers.
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Abbreviations
BMI:
body mass index
CI:
confidence interval
OR:
odds ratio
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Authors and Affiliations
- Department of Clinical Epidemiology, Aarhus University Hospital and Aalborg Hospital, Aarhus, Denmark
Søren P. Johnsen & Henrik T. Sørensen - Department of Epidemiology and Social Medicine, Aarhus University, Aarhus, Denmark
Kim Overvad - Research Unit Q, Department of Infectious Diseases, Aarhus University Hospital, Aarhus, Denmark
Lars Østergaard - Institute of Cancer Epidemiology, Danish Cancer Society, Copenhagen, Denmark
Anne Tjønneland - Department of Cardiology and Internal Medicine, Aarhus County Hospital, Aarhus University Hospital, Copenhagen, Denmark
Steen E. Husted
Authors
- Søren P. Johnsen
- Kim Overvad
- Lars Østergaard
- Anne Tjønneland
- Steen E. Husted
- Henrik T. Sørensen
Corresponding author
Correspondence toSøren P. Johnsen.
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Johnsen, S.P., Overvad, K., Østergaard, L. et al. Chlamydia pneumoniae seropositivity and risk of ischemic stroke:.Eur J Epidemiol 20, 59–65 (2005). https://doi.org/10.1007/s10654-004-4341-5
- Accepted: 11 March 2004
- Issue date: January 2005
- DOI: https://doi.org/10.1007/s10654-004-4341-5