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Volume 10, Number 8—August 2004

Research

Acute Encephalitis Hospitalizations, California, 1990–1999: Unrecognized Arboviral Encephalitis?

Rosalie T. Trevejo*Comments to Author 
Author affiliation: *Western University, Pomona, California, USA

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Table 4

SLEV- and WEEV-positive Culex tarsalis pools in selected California counties, 1991–1999a,b

Year
No. of virus-positive mosquito pools (no. pools testedc
Sacramento-Yolo Sutter-Yuba Imperial-Riverside

WEEV
WEEV
WEEV
SLEV
1991
0
0
73
44
1992
0
0
20
10
1993
81
31
13
15
1994
4
0
1
7
1995
2
1
0
0
1996
9
2
0
1
1997
10
14
0
0
1998
0 (187)
0 (172)
11 (968)
1 (968)
1999 0 (548) 0 (232) 0 (918) 0 (918)

aSLEV, St. Louis encephalitis virus; WEEV, Western equine encephalitis virus.
bSources: Hui et al., 1999 (1991–1997); CDHS, Vector-Borne Disease Section, Annual Reports (1998 & 1999).
cThe number of mosquito pools tested (denominator) was only available for 1998 and 1999.

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