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Risk factors for coronary heart disease and persistent infection with Chlamydia pneumoniae or cytomegalovirus: a
1Clinical Trial Service Unit, Radcliffe Infirmary, Oxford, UK. john.danesh@balliol.ox.ac.uk
Insights
Persistent infections with Chlamydia pneumoniae and cytomegalovirus show limited links to common vascular risk factors. This suggests these factors may not significantly influence the observed coronary heart disease associations.
Area of Science:
- Cardiovascular epidemiology
- Infectious disease research
- Vascular health
Background:
- Epidemiological studies link coronary heart disease to persistent Chlamydia pneumoniae and cytomegalovirus infections.
- Research on the relationship between these infections and vascular risk factors is limited.
Purpose of the Study:
- To investigate correlations between serum antibodies for C. pneumoniae and cytomegalovirus.
- To assess associations with vascular risk factors, inflammation markers, and socioeconomic status.
Main Methods:
- Cross-sectional sero-epidemiological study within a randomized trial.
- Involved 704 individuals from five general practices in Bedfordshire, UK.
- Measured vascular risk factors, inflammation markers, and other characteristics.
Main Results:
- C. pneumoniae antibodies correlated with male sex and smoking (2P < 0.01).
- Cytomegalovirus antibodies correlated with age (2P < 0.001).
- No significant associations found with other measured factors.
Conclusions:
- Serological evidence of persistent C. pneumoniae or cytomegalovirus infection is not strongly linked to most vascular risk factors.
- These risk factors are unlikely to confound or mediate reported associations with coronary heart disease.
Background:
A large number of epidemiological and pathological studies have reported on associations between coronary heart disease and persistent infection with Chlamydia pneumoniae or cytomegalovirus, but relatively few have reported on possible relations between these infections and vascular risk factors.
Objective:
To determine whether serum concentrations of immunoglobulin G antibodies to C. pneumoniae or cytomegalovirus are correlated to standard vascular risk factors, markers of inflammation and indicators of socioeconomic status.
Methods:
We performed a cross-sectional sero-epidemiological study nested within a randomized trial involving five general practices in Bedfordshire, UK. We made measurements of a number of standard vascular risk factors, serum markers of systemic inflammation and other relevant characteristics in 704 individuals.
Results:
There were significant associations between C. pneumoniae immunoglobulin G levels and male sex and cigarette smoking (2P < 0.01 for each) and between cytomegalovirus immunoglobulin G levels and age (2P < 0.001). Other factors were not significantly associated with serum antibodies to either persistent infection.
Conclusions:
Serological evidence of persistent infection with C. pneumoniae or cytomegalovirus in this population was not strongly associated with most standard vascular risk factors and other characteristics. The main implication is that such risk factors are not likely to be important confounders or mediators of the reported associations between coronary heart disease and these agents.
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