California Plague Report, Winter 2010

Follow this link to read the report on California plague surveillance for the winter of 2010.

Plague report 2010

Plague report for winter, 2010


To view a report on plague surveillance activities for winter of 2010 from the Vector-Borne Disease Section, California Department of Public Health press this link: PDF report.

Plague positive rodents 2008

The following link is to a table showing plague-positive rodents tested in conjunction with the California Department of Public Health, Vector-borne Disease Section Plague Surveillance Program.

Plague-positive rodents 2008

Ixodes pacificus ticks tested for evidence of Borrelia species, California, 2008.

The following table contains the results of tests for evidence of Borrelia infection in ticks collected in California in 2008. The tests were conducted by the California Department of Public Health, Vector-Borne Disease Section (CDPH-VBDS), and by the United States Army Center for Health Promotion and Preventive Medicine - West (US Army).

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.

Plague testing 2004

The California Department of Public Health routinely tests various types of animals for evidence of infection by plague bacilli. The map displays data for 2004 for tests on carnivores, rodents, and pets.


Human granulocytic anaplasmosis (HGA) is an infection caused by the bacteria Anaplasma phagocytophilum. HGA bacteria infect the whte blood cells of their hosts, specifically a group of cells called granulocytes. People acquire HGA in California, when they are bitten with a western black-legged tick (Ixodes pacificus) infected with HGA bacteria.

Tickborne Relapsing Fever

Tickborne relapsing fever (TBRF) is a bacterial disease transmitted to people by soft ticks in the genus Ornithodoros. TBRF is a rare disease in California with between 1 and 8 cases reported per year, generally during the summer months. People are at risk of contracting TBRF when they sleep in rustic mountain cabins that are infested with wild rodents. The soft ticks that transmit TBRF feed rapidly; most people who contract TBRF have no recollection of a tick bite.