Malaria vectors in a traditional dry zone village in Sri Lanka
Malaria vectors in a traditional dry zone village in Sri Lanka
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DOI：
10.4269/ajtmh.1999.60.421
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发表时间：
1999-03-01
影响因子：
3.3
通讯作者：
Wirtz, RA
中科院分区：
文献类型：
--
作者：
Amerasinghe, PH;Amerasinghe, FP;Wirtz, RA
1994年8月至1997年2月期间，在斯里兰卡中北部疟疾流行的低地干旱区的一个传统的以坦克灌溉为基础的水稻生产村庄，对按蚊传播疟疾进行了研究。从人和牛科动物诱饵捕获物、牛科动物诱饵陷阱小屋、室内捕获物和陷阱中收集成蚊。通过ELISA检测苔藓头胸是否存在恶性疟原虫和间日疟原虫，并检测充血的苔藓是否存在人血。每隔两天进行一次入户调查，以记录村民中经血膜证实的疟疾病例。共采集雌性按蚊14种7,823只。按蚊丰度的趋势与前一个月的降雨量显着相关。annularis、环纹隐翅虫An. barbirostris、尖吻隐翅虫An. subpictus、隐翅虫An. vagus和An. varuna，但在An. culicifacies和An.有足的在7种蚊子中发现疟原虫感染，75%的阳性蚊子含有恶性疟原虫和25%的间日疟原虫。从载体（即，Art. varuna）第一次在斯里兰卡。使用丰度、环子孢子（CS）蛋白率和人类血液指数（HBI）计算感染性媒介（MIV）率的平均数显示，在AN中的感染率最高。库利西相1994年10月至1995年1月发生了疟疾暴发，其中45.5%的村民至少经历过一次疾病发作。此后，疟疾发病率一直很低。按蚊culicifaces丰富滞后一个月的爆发期间每月疟疾发病率呈正相关，虽然这一物种的丰度排名第五，感染与高MIV率，由于高CS蛋白率和HBI。其他物种的发病趋势与疟疾没有显着相关性。最后得出结论，安。蚊是研究区最重要的媒介。
Malaria transmission by anopheline mosquitoes was studied in a traditional tank-irrigation-base rice-producing village in the malaria-endemic low country dry zone of northcentral Sri Lanka during the period August 1994-February 1997. Adult mosquitoes were collected from human and bovid bait catches, bovid-baited trap huts, indoor catches, and pit traps. Mosquito head-thoraces were tested for the presence of Plasmodium falciparum and P. vivax, and blood-engorged abdomens for the presence of human blood by ELISAs. House surveys were done at two-day intervals to record cases of blood film-confirmed malaria among the villagers. A total of 7,823 female anophelines representing 14 species were collected. Trends in anopheline abundance were significantly correlated with rainfall of the preceding month in An. annularis, An. barbirostris, An. subpictus, An. vagus, and An. varuna, but were not significant in An. culicifacies and An. peditaeniatus. Malaria parasite infections were seen in seven mosquito species, with 75% of the positive mosquitoes containing P. falciparum and 25% P. vivax. Polymorph PV247 was recorded from a vector (i.e., Art. varuna) for the first time in Sri Lanka. Computations of mean number of infective vector (MIV) rates using abundance, circumsporozoite (CS) protein rate, and human blood index (HBI) showed the highest rate in An. culicifacies. A malaria outbreak occurred from October 1994 to January 1995 in which 45.5% of village residents experienced at least a single disease episode. Thereafter, malaria incidence remained low. Anopheles culicifacies abundance lagged by one month correlated positively with monthly malaria incidence during the outbreak period, and although this species ranked fifth in terms of abundance, infection was associated with a high MIV rate due to a high CS protein rate and HBI. Abundance trends in other species did not correlate significantly with malaria. It was concluded that An. culicifacies was epidemiologically the most important vector in the study area.