Use of Chlamydia trachomatis high-resolution typing: an extended case study to distinguish recurrent or persistent infection from new infection.
Sex Transm Infect
; 90(2): 155-60, 2014 Mar.
Article
em En
| MEDLINE
| ID: mdl-24234071
ABSTRACT
OBJECTIVES:
Repeated infections of Chlamydia trachomatis may be new infections or persistent infections due to treatment failure or due to unresolved infections in sexual partners. We aimed to establish the value of using high-resolution multilocus sequence typing (CT-MLST) to discriminate repeated C trachomatis infections.METHODS:
Paired C trachomatis positive samples (baseline (T0) and after 6 months (T1)) were selected from two Dutch screening implementation studies among young heterosexual people. Typing with six CT-MLST loci included the ompA gene. The uniqueness of strains was assessed using 256 reference CT-MLST profiles.RESULTS:
In 27 out of 34 paired cases, full sequence types were obtained. A multilocus (13 cases) or single locus variant (4 cases) was seen, indicating 17 new C trachomatis infections at T1. The ompA genovar was identical for 5 of 17 discordant cases. The 10 cases with concordant typing results were categorised as treatment failure (5 cases) versus persistent or recurrent infections (5 cases). Surprisingly, these concordant cases had C trachomatis strains that were either unique or found in small clusters. The median time between T0 and T1 did not differ between the concordant and discordant cases.CONCLUSIONS:
High-resolution typing was superior in discriminating new infections compared with only using ompA genovar typing. Many cases (37%) showed exactly the same C trachomatis strain after 6 months. CT-MLST is not conclusive in distinguishing recurrent infections from treatment failure.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Proteínas da Membrana Bacteriana Externa
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Infecções por Chlamydia
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Chlamydia trachomatis
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Tipagem de Sequências Multilocus
Tipo de estudo:
Diagnostic_studies
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Observational_studies
/
Risk_factors_studies
Limite:
Adult
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Female
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Humans
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Male
País como assunto:
Europa
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article