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Laboratory Detection of First and Repeat Chlamydia Cases Influenced by Testing Patterns: A Population-Based Study
Laura H Thompson1, Zoann Nugent2, John L Wylie3,4
1Centre for Global Public Health, University of Manitoba, Winnipeg, MB, Canada.
Microbiology Insights
|March 6, 2019
Summary
Chlamydia infection trends in Manitoba are closely linked to testing volumes. Incidence calculations may be inaccurate if they don't account for how often people are tested for chlamydia.
Area of Science:
- Public Health and Epidemiology
- Infectious Disease Surveillance
Background:
- Chlamydia incidence is notably high in Manitoba, with disproportionate rates among young women and in northern regions.
- Accurate estimation of chlamydia incidence is crucial for effective public health interventions and resource allocation.
Purpose of the Study:
- To describe and explore the driving factors behind reported chlamydia infection trends in Manitoba, Canada.
- To evaluate the influence of testing patterns on chlamydia incidence calculations.
Main Methods:
- Analysis of surveillance and laboratory testing data from Manitoba Health using SAS v9.4.
- Construction of Kaplan-Meier plots for time to first and second chlamydia infections.
- Application of Cox proportional hazards regression to estimate the risk of repeat infections.
Main Results:
- Reported chlamydia infections closely mirrored testing volumes across the study period.
- Decreases in first infections among females correlated with decreased first testing.
- Increasing repeat testing in females (2008-2012) corresponded with rising positive results (2009-2013); males showed steady increases in repeat testing and positive results (2008-2016).
Conclusions:
- Chlamydia infection rates consistently include a significant proportion of repeat infections.
- Case-based surveillance data alone may not accurately reflect chlamydia incidence due to heavy influence by testing volumes.
- Improving testing rates and accessibility is recommended to enhance screening, treatment, and understanding of true disease occurrence.
Keywords:
Manitobachlamydiaepidemiologynucleic acid amplification testrecurrencerepeat infectionsexually transmitted infectiontestingMore Related Videos
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