Home sampling and pooling of vaginal samples are effective tools for genetic screening of Chlamydia trachomatis among high school female students in Lithuania.

The aims were 1) to estimate the prevalence of C. trachomatis infection among sexually active female students in Kaunas, Lithuania; 2) to investigate the usefulness of personal invitation, self-sampling, and pooling of samples for screening; and 3) to evaluate the costs of the approaches used. A cross-sectional study inviting 795 female students (18-31 y of age) from 7 high schools and 1 college in Kaunas was performed. The response rate was 67% (533/795). Self-obtained vaginal samples were analysed, individually and pooled (n = 3), using Digene Hybrid Capture II CT/NG Test. The overall prevalence of C. trachomatis infection was 5.6%. Among the sexually active female students 20-24 y of age (n = 424), the prevalence was 7.1%; however, the prevalence varied from 0% to 14.2% at the different schools. For estimation of the population prevalence based solely on identification of C. trachomatis positive pools, the pooling strategy reduced the costs by 85%. For estimation of population prevalence and for diagnosis of each individual sample, pooling reduced the costs by 70%. Targeted screening, using pooling to reduce the expenses, mainly of 3rd and 4th y Lithuanian female students could be recommended. By extended personal contact and internet-based communication, increased participation rates may be attained.

Pooling of urine specimens allows accurate and cost-effective genetic detection of Chlamydia trachomatis in Lithuania and other low-resource countries.

The aims of this study were to compare performance characteristics and cost-effectiveness of pooling urine samples for screening and diagnosis of Chlamydia trachomatis using Digene Hybrid Capture II CT/NG Test (HCII), and to examine the prevalence of C. trachomatis in male military recruits in Lithuania. A total of 410 urine samples were individually tested and pooled by 5 and 10 samples, respectively. The sensitivity and specificity of diagnosis were not affected by either pooling strategy. The estimated population prevalence of C. trachomatis infection was nearly identical, i.e. 4.4%, 4.4% and 4.1% based on individually tested samples, and samples pooled by 5 and 10, respectively. For this estimation of the population prevalence, pooling 5 samples reduced the costs by 80% and pooling 10 samples reduced the costs by 90%. For diagnosis of each individual sample, the pooling strategies resulted in cost savings of 60% (5 samples per pool) and 56% (10 samples per pool). The present pooling strategies were sensitive, specific and cost-efficient for screening and diagnosis of C. trachomatis infection in male military recruits in Lithuania. The strategies would be most useful for reasonably inexpensive large-scale screening, prevalence studies and even diagnostics in Lithuania and many other low-resource countries.