Spatial clustering of high load ocular Chlamydia trachomatis infection in trachoma: a cross-sectional population-based study.

Spatial clustering of high load ocular Chlamydia trachomatis infection in trachoma: a cross-sectional population-based study.
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DOI:
10.1093/femspd/ftx050
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发表时间:
2017-07-31
影响因子:
3.3
通讯作者:
Bailey R
Bailey R
中科院分区:
医学4区
文献类型:
--
作者:
Last A;Burr S;Alexander N;Harding-Esch E;Roberts CH;Nabicassa M;Cassama ETDS;Mabey D;Holland M;Bailey R

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沙眼衣原体(Ct)是全世界细菌性性传播感染和传染性致盲(沙眼)的最常见原因。了解Ct感染的空间分布可能使我们能够识别处于风险中的人群,并提高我们对Ct传播的理解。在这项研究中,我们试图调查的空间分布的Ct感染和高Ct负荷的沙眼流行的社区比热戈斯群岛(几内亚比绍)的临床特征。我们收集了1507结膜样本和相应的详细的临床资料,在一个横断面人口为基础的地理空间代表性沙眼调查。我们使用液滴数字PCR来估计结膜拭子上的Ct负荷。使用地统计学工具研究眼部Ct感染的聚集性。空间集群(独立于年龄和性别)的个人与高Ct负荷的空间关联的本地指标进行了鉴定。我们没有发现低负荷感染的个体聚集。这些数据表明,高细菌负荷的感染可能是重要的Ct传输。这些地理空间工具可能是有用的,在研究的眼部Ct传播动力学和沙眼监测治疗后的一部分,以确定集群的感染和阈值的Ct负荷,可能是重要的焦点,重新出现的感染在社区。我们确定了高负荷Ct感染的集群,表明高负荷感染可能在传播中很重要,这可能对沙眼消除策略和监测产生影响。
Chlamydia trachomatis (Ct) is the most common cause of bacterial sexually transmitted infection and infectious cause of blindness (trachoma) worldwide. Understanding the spatial distribution of Ct infection may enable us to identify populations at risk and improve our understanding of Ct transmission. In this study, we sought to investigate the spatial distribution of Ct infection and the clinical features associated with high Ct load in trachoma-endemic communities on the Bijagós Archipelago (Guinea Bissau). We collected 1507 conjunctival samples and corresponding detailed clinical data during a cross-sectional population-based geospatially representative trachoma survey. We used droplet digital PCR to estimate Ct load on conjunctival swabs. Geostatistical tools were used to investigate clustering of ocular Ct infections. Spatial clusters (independent of age and gender) of individuals with high Ct loads were identified using local indicators of spatial association. We did not detect clustering of individuals with low load infections. These data suggest that infections with high bacterial load may be important in Ct transmission. These geospatial tools may be useful in the study of ocular Ct transmission dynamics and as part of trachoma surveillance post-treatment, to identify clusters of infection and thresholds of Ct load that may be important foci of re-emergent infection in communities. We identified clusters of high load Ct infections suggesting that high load infections may be important in transmission, which may have implications in trachoma elimination strategies and surveillance.
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