Related Experiment Video
Updated: May 24, 2026

Generating Whole Bacterial Genomes from Clinical Samples using a Target Enrichment Workflow
Published on: August 15, 2025
Does a clinical guideline change chlamydia testing? Report from the Waikato Chlamydia Project
Jane Morgan1, Andre Donnell, Anita Bell
1Waikato Hospital, PB3200, Hamilton, New Zealand. jane.morgan@waikatodhb.health.nz
Insights
A national chlamydia management guideline did not significantly increase chlamydia testing rates in New Zealand. Efforts to optimize sexual health screening require ongoing evaluation and focus on at-risk populations.
Area of Science:
- Public Health
- Sexual Health
- Infectious Disease Management
Background:
- Waikato District Health Board piloted a national chlamydia management guideline to improve testing and treatment.
- Prior New Zealand research indicated that intervention-driven increases in testing may not be sustained.
Purpose of the Study:
- To evaluate the impact of a national chlamydia management guideline on testing volumes and treatment rates.
- To assess changes in chlamydia testing uptake by age, gender, and ethnicity following guideline implementation.
Main Methods:
- Compared district-wide chlamydia test volumes across three periods: before (2008), during (2009), and after (2010) guideline implementation.
- Calculated crude population test uptake and assessed Azithromycin pharmacy claims for treatment rates.
Main Results:
- Chlamydia testing uptake among women aged 15-24 was already high (23% in 2008).
- While testing increased in under-25-year-olds during 2009, the change was not statistically significant or sustained in 2010 (p=0.06).
- No significant sustained changes in testing were observed based on gender or ethnicity post-implementation.
Conclusions:
- The guideline did not lead to significant, sustained increases in chlamydia testing across demographic groups.
- Further research is needed to determine the optimal age threshold for chlamydia screening in New Zealand.
- Enhancing primary care support, training, and focusing on high-risk groups are crucial for effective sexual health strategies.
Background And Context:
Waikato District Health Board was one of three districts chosen to implement a national chlamydia management guideline, with the aim of optimising testing and treatment. Previous New Zealand studies suggest any test increases associated with such an intervention may be short-lived.
Assessment Of Problem:
District-wide chlamydia test volumes were compared for three periods, before (June-Nov 2008), during (June-Nov 2009) and after (June-Nov 2010) guideline implementation by age, gender and ethnicity. Crude estimates of population test uptake were calculated. Azithromycin pharmacy claim volumes were assessed as a measure of treatment.
Results:
Chlamydia test uptake for women was already high, with 23% of 15- to 24-year-old women tested during the period from June to November 2008. Although tests from under-25-year-olds increased during implementation in 2009, the change was not significant and was not sustained in 2010, p=0.06. Similarly, there were no significant sustained changes by gender or ethnicity following implementation.
Strategies For Improvement:
This includes a continued emphasis on optimal chlamydia case finding and treatment by focusing on those at greater risk of infection. Efforts to improve partner notification should be instigated which may in turn better engage men around sexual health.
Lessons:
Local data should be used to identify local issues. There is a need to determine whether <25 years is the optimal age threshold for targeted chlamydia testing in New Zealand and to ensure appropriate resources, training and support are in place for primary care nurses who play a pivotal role in sexual health care delivery.
Related Concept Videos
Sexually Transmitted Infections
Clinical Trials: Overview
Clinical Trials
There are four phases in a clinical trial. A phase one...
Urinary Tract Infection III: Diagnostic Studies and Interprofessional Care
Guidelines and Strategies for Safe Computer Charting
Maintain Confidentiality and Security:
Acute Pyelonephritis II: Diagnostic Studies and Management