Mammals tested for plague in California, 2007

In 2007, 482 blood samples were collected from wild carnivores and 914 blood samples from wild rodents in connection with the statewide plague surveillance program conducted by the Vector-borne Disease Section of the California Department of Public Health. Veterinarians submitted 5 samples from domestic pets. Plague was confirmed in one domestic cat from Kern County. Plague antibodies were detected in 37 of 335 coyotes, 12 of 47 black bears, and one of 4 gray foxes. Among wild rodents, antibodies were detected in 23 of 432 California ground squirrels, and one of 237 chipmunks. Additionally, samples from 124 feral pigs were negative. All data from 2007 Annual Report, Vector-Borne Disease Section, California Department of Public Health.

 

A summary of the blood samples tested are shown in the following table:

 

County
Rodents
Carnivores
Tested
Positive
Species
Tested
Positive
Species
Alameda
4
0   4 0  
Butte
6
0        
El Dorado
29
0        
Fresno
23
0        
Imperial      
25
0  
Inyo
153
18
California ground squirrel
     
  1
Chipmunk
     
Kern
7
0   144 2
Coyote
       
1
Domestic cat
Lassen
1
0        
Los Angeles
5
0   24 0  
Madera
24
0        
Mariposa
4
0   34 2
Black bear
Mendocino       12 0  
Modoc       43 16
Coyote
Mono
202
0        
Monterey       24    
Napa
30
0        
Nevada
4
0        
Orange
4
0   1 0  
Placer       5 0  
Plumas
1
0   63 8
Black bear
       
13
Coyote
       
1
Gray fox
Riverside
119
0        
San Benito       6 0  
San Bernardino
189
3
California ground squirrel
     
San Diego
21
2
California ground squirrel
8 0  
San Francisco       2 0  
San Joaquin       6 0  
San Luis Obispo
12
0   34 0  
Santa Barbara
1
0   13 0  
Shasta
1
0        
Sierra
2
0   22 2
Black bear
       
6
Coyote
Siskiyou
16
0   4 0  
Tuolumne
26
0   2 0  
Ventura
30
0   3 0  
Yuba

 

3 0

Totals
914
24
 
482
51