RESUMEN
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.
Asunto(s)
Infecciones por Chlamydia/diagnóstico , Tamizaje Masivo/métodos , Autocuidado/métodos , Enfermedades Vaginales/diagnóstico , Adolescente , Adulto , Infecciones por Chlamydia/epidemiología , Chlamydia trachomatis/genética , Chlamydia trachomatis/aislamiento & purificación , Análisis Costo-Beneficio , Femenino , Humanos , Lituania/epidemiología , Análisis de Secuencia por Matrices de Oligonucleótidos , Prevalencia , Conducta Sexual , Manejo de Especímenes , Estudiantes , Enfermedades Vaginales/epidemiología , Enfermedades Vaginales/microbiología , Frotis Vaginal/métodosRESUMEN
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.