Surveillance of viral haemorrhagic fevers in ghana: entomological assessment of the risk of transmission in the northern regions.

Surveillance of viral haemorrhagic fevers in ghana: entomological assessment of the risk of transmission in the northern regions.
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加纳病毒性​​出血热监测：北部地区传播风险的昆虫学评估。

DOI：
10.4314/gmj.v40i3.55269
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发表时间：
2010
期刊：
Ghana medical journal
影响因子：
--
通讯作者：
D. Ofori
D. Ofori
中科院分区：
--
文献类型：
--
作者：
M. Appawu;S. Dadzie;H. Abdul;H. Asmah;D. Boakye;M. Wilson;D. Ofori

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简要说明 评估病毒性出血热在加纳北方的传播风险。 设计 在加纳北方的四个社区进行了一项为期两年的横断面昆虫学研究。采用卫生组织的标准方法收集伊蚊的成虫和幼虫，以估计人与病媒的接触率和幼虫指数。 结果 共调查了2804户家庭，以估计黄热病和登革热等病毒性出血热潜在病媒的幼虫指数和人-病媒接触。每个研究地点超过56%的住户对伊蚊幼虫呈阳性反应。估计Damongo（BI：180和CI：44.8）和Jirapa（BI：149.7和CI：41.5）的Breteaux指数（BI）和Container指数（CI）相对较高，而Tumu（BI：76.1和CI：19.5）和Bolgatanga（BI：72.4和CI：20.6）。Damongo和Jirapa的咬人率估计分别为9.8和18.5口/人/小时，而Bolgatanga记录的是10 B/M/H。一般而言，所有研究地点的人-病媒接触率在旱季高于雨季。幼虫指数显示季节性变化，旱季被确定为病毒性出血热传播和可能爆发疾病的高风险时期。用RT-PCR方法从调查点采集的2034只伊蚊中未检出黄病毒。 结论 在所有研究地区，伊蚊幼虫密度和成虫叮咬率足以促进病毒性出血热的暴发。
SUMMARY OBJECTIVES To assess the risk of transmission of viral haemorrhagic fevers in northern Ghana. DESIGN A two-year cross-sectional entomological study was carried out in four communities in the northern part of Ghana. Standard WHO methods were used to collect adult and larvae of Aedes mosquitoes to estimate man-vector contact rates and larval indices. RESULTS A total of 2804 households were surveyed to estimate larval indices and man-vector contacts of potential vectors of viral haemorrhagic fevers such as Yellow fever and Dengue. Over 56% households in each study site were positive for Aedes larvae. Relatively higher Breteaux index (BI) and Container index (CI) were estimated in Damongo (BI: 180 and CI: 44.8) and Jirapa (BI: 149.7 and CI: 41.5) compared to Tumu (BI: 76.1 and CI: 19.5) and Bolgatanga (BI: 72.4 and CI: 20.6). Man-biting rates of 9.8 and 18.5 bites /man/hour were estimated for Damongo and Jirapa respectively whilst Bolgatanga recorded 10 B/M/H. Generally, man-vector contact rates in all the study sites were higher during the dry season than the wet season. Larval indices showed seasonal variations and the dry season was identified as the high-risk period for transmission of viral haemorrhagic fevers and possible disease outbreaks. No flavivirus was detected in the 2034 Aedes mosquitoes from the study sites by RT-PCR. CONCLUSIONS Aedes mosquito larval densities and adult biting rates, in all the study areas were sufficient to promote outbreaks of viral haemorrhagic fevers.