CORRELATION OF CULEX-TARSALIS POPULATION INDEXES WITH THE INCIDENCE OF ST-LOUIS ENCEPHALITIS AND WESTERN EQUINE ENCEPHALOMYELITIS IN CALIFORNIA
CORRELATION OF CULEX-TARSALIS POPULATION INDEXES WITH THE INCIDENCE OF ST-LOUIS ENCEPHALITIS AND WESTERN EQUINE ENCEPHALOMYELITIS IN CALIFORNIA
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DOI：
10.4269/ajtmh.1979.28.335
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发表时间：
1979-01-01
影响因子：
3.3
通讯作者：
MILBY, MM
中科院分区：
文献类型：
--
作者：
OLSON, JG;REEVES, WC;MILBY, MM
分析了1953-1973年美国加利福尼亚州的蚊子种群指数，以确定它们与圣路易斯脑炎(SLE)和西部马脑脊髓炎(WEE)病毒活动的关系。用新泽西州诱灯指数(LTI)测量的塔氏锥虫雌性种群与人类脑炎发病率呈正相关，是预测脑炎高发年份的可靠手段。城市地区未检测到人类SLE和WEE病例的最低抑菌浓度为0.1。与显著的人类SLE或WEE发病率相关的城市塔沙尔丝虫的临界水平介于LTI 6.4(对于常住人口较多的农村蚊子消减地区[MAD])到62.4(对于人口相对较少的城市MAD)。人类SLE和WEE年发病率的高峰期出现在城市地区的女性季节性平均群体LTI达到21的年份。SLE和WEE的周发病率峰值分别与城市陷阱每周LTI分别为21和81有关。城市LTI为10~19.9和5~9.9时，蚊池中SLE病毒分离率最高，向地方性宿主传播最高。城市低感染指数为1~4.9时，弱毒分离率和流行传播率最高。
Mosquito population indices from California [USA] for 1953-1973 were analyzed to determine their association with activity of St. Louis encephalitis (SLE) and western equine encephalomyelitis (WEE) viruses. C. tarsalis female populations, as measured by New Jersey light trap indices (LTI), correlated positively with the incidence rates of encephalitis in humans and were a reliable means of forecasting the years of highest incidence. The critical level of C. tarsalis in urban areas below which no human cases of SLE and WEE were detected was an LTI of 0.1. Critical urban levels of C. tarsalis associated with significant human SLE or WEE incidence ranged between LTI of 6.4 (for rural mosquito abatement districts [MAD] with large resident human populations) and 62.4 (for urban MAD with relatively small human populations). Peaks in annual incidence of SLE and WEE in humans occurred during years when seasonal average C. tarsalis female populations in urban areas reached a LTI of 21. Peaks in weekly incidence of SLE and WEE were associated, respectively, with weekly LTI of 21 and 81 in urban traps. Isolation rates of SLE virus from mosquito pools and transmission of the virus to enzootic hosts were highest when urban LTI were 10-19.9 and 5-9.9, respectively. The WEE viral isolations and enzootic transmission rates were highest when LTI in urban areas were 1-4.9.