Dead Birds Reported, Tested, and Positive
for WNV by County in California in 2007
Year To Date (Weeks 1 - 41)

County	Reported*	Tested	Positive	% Tested Positive
Alameda	1065	176	17	10%
Alpine	6	2	-	-
Amador	112	29	1	3%
Butte	1045	121	27	22%
Calaveras	208	33	3	9%
Colusa	50	12	4	33%
Contra Costa	2042	283	27	10%
Del Norte	46	11	-	-
El Dorado	441	95	7	7%
Fresno	2010	270	112	41%
Glenn	158	61	36	59%
Humboldt	147	36	2	6%
Imperial	11	1	-	-
Inyo	47	5	1	20%
Kern	1888	275	123	45%
Kings	191	31	9	29%
Lake	145	19	3	16%
Lassen	84	24	2	8%
Los Angeles	2518	551	152	28%
Madera	158	32	6	19%
Marin	455	55	3	5%
Mariposa	49	9	-	-
Mendocino	115	20	3	15%
Merced	484	82	33	40%
Modoc	19	5	1	20%
Mono	60	4	-	-
Monterey	349	41	-	-
Napa	139	6	2	33%
Nevada	326	77	4	5%
Orange	833	167	20	12%
Placer	1002	87	16	18%
Plumas	81	24	1	4%
Riverside	649	37	6	16%
Sacramento	5985	328	135	41%
San Benito	56	19	-	-
San Bernardino	795	144	26	18%
San Diego	874	276	100	36%
San Francisco	161	32	1	3%
San Joaquin	1581	83	42	51%
San Luis Obispo	322	59	6	10%
San Mateo	585	130	2	2%
Santa Barbara	208	22	1	5%
Santa Clara	1998	234	73	31%
Santa Cruz	357	74	6	8%
Shasta	808	130	46	35%
Sierra	13	3	-	-
Siskiyou	34	7	4	57%
Solano	602	19	3	16%
Sonoma	849	124	11	9%
Stanislaus	1465	232	127	55%
Sutter	255	6	1	17%
Tehama	199	52	19	37%
Trinity	60	13	1	8%
Tulare	572	108	33	31%
Tuolumne	146	28	1	4%
Ventura	628	120	11	9%
Yolo	648	127	24	19%
Yuba	120	8	1	13%
State Totals	36254	5059	1295	26%

^* Birds in a die-off are not included in reported totals because the deaths are not related to WNV. A die-off is defined as a group of 10 or more same species dead birds unless the species is American Crow.
Source: Vector-Borne Disease Section, California Department of Public Health