Drought-induced amplification of Saint Louis encephalitis virus, Florida

被引:82
作者
Shaman, J
Day, JF
Stieglitz, M
机构
[1] Columbia Univ, Lamont Doherty Geol Observ, Palisades, NY 10964 USA
[2] Univ Florida, Vero Beach, FL USA
关键词
D O I
10.3201/eid0806.010417
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
We used a dynamic hydrology model to simulate water table depth (WTD) and quantify the relationship between Saint Louis encephalitis virus (SLEV) transmission and hydrologic conditions in Indian River County, Florida, from 1986 through 1991, a period with an SLEV epidemic. Virus transmission followed periods of modeled drought (specifically low WTDs 12 to 17 weeks before virus transmission, followed by a rising of the water table 1 to 2 weeks before virus transmission). Further evidence from collections of Culex nigripalpus (the major mosquito vector of SLEV in Florida) suggests that during extended spring droughts vector mosquitoes and nestling, juvenile, and adult wild birds congregate in selected refuges, facilitating epizootic amplification of SLEV. When the drought ends and habitat availability increases, the SLEV-infected Cx. nigripalpus and wild birds disperse, initiating an SLEV transmission cycle. These findings demonstrate a mechanism by which drought facilitates the amplification of SLEV and its subsequent transmission to humans.
引用
收藏
页码:575 / 580
页数:6
相关论文
共 29 条
[1]  
Beven K.J., 1979, HYDROL SCI B, V24, P43, DOI [DOI 10.1080/02626667909491834, 10.1080/02626667909491834]
[2]  
Beven K. J., 1986, Hillslope Processes, P187, DOI [10.4324/9781003028840, DOI 10.4324/9781003028840]
[3]  
Beven K. J., 1986, SCALE PROBLEMS HYDRO, P107, DOI DOI 10.1007/978-94-009-4678-1_6
[4]  
BEVEN KJ, 1994, TOP MODEL GRIDATB US
[5]   VECTOR STUDIES IN ST LOUIS ENCEPHALITIS EPIDEMIC TAMPA BAY AREA FLORIDA 1962 [J].
CHAMBERLAIN, RW ;
COLEMAN, PH ;
BEADLE, LD ;
SUDIA, WD .
AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE, 1964, 13 (03) :456-&
[6]   Avian serology in a St. Louis encephalitis epicenter before, during, and after a widespread epidemic in south Florida, USA [J].
Day, JF ;
Stark, LM .
JOURNAL OF MEDICAL ENTOMOLOGY, 1999, 36 (05) :614-624
[7]   Blood feeding and oviposition by Culex nigripalpus (Diptera: Culicidae) before, during, and after a widespread St. Louis encephalitis virus epidemic in Florida [J].
Day, JF ;
Curtis, GA .
JOURNAL OF MEDICAL ENTOMOLOGY, 1999, 36 (02) :176-181
[8]  
DAY JF, 1993, J AM MOSQUITO CONTR, V9, P249
[9]   Frequency of Saint Louis encephalitis virus in humans from Florida, USA: 1990-1999 [J].
Day, JF ;
Stark, LM .
JOURNAL OF MEDICAL ENTOMOLOGY, 2000, 37 (04) :626-633
[10]   RAINFALL-DIRECTED OVIPOSITION BEHAVIOR OF CULEX-NIGRIPALPUS (DIPTERA, CULICIDAE) AND ITS INFLUENCE ON ST-LOUIS ENCEPHALITIS-VIRUS TRANSMISSION IN INDIAN RIVER COUNTY, FLORIDA [J].
DAY, JF ;
CURTIS, GA ;
EDMAN, JD .
JOURNAL OF MEDICAL ENTOMOLOGY, 1990, 27 (01) :43-50