Plague

chd_flea_noplague

Plague is a highly infectious disease caused by bacteria. Plague is primarily a disease of rodents, but humans and their pets (dogs and especially cats) can also become infected. Infection can occur when humans or pets live in or visit areas where wild rodents are naturally infected or if the disease is transferred to domestic rats that live closely with people.

The Vector Control Program routinely collects fleas and blood samples from squirrels in our local mountains and campgrounds. If tests come back positive for plague, park rangers are notified, squirrel burrows are treated for fleas, and warning signs are posted to inform the public on how to avoid fleas and protect themselves and their pets from this serious disease.

Plague Symptoms 
In humans, the initial symptoms of plague include chills, fever, headache, muscle aches, weakness and most commonly swollen and tender lymph nodes (called buboes). This stage is called the bubonic plague.  Plague symptoms usually appear 2 to 6 days after infection. Plague is treatable when found early.

An animal with plague will become very ill, may stop eating and will have a fever. Swollen lymph glands may occur, generally in the neck area. INFORM YOUR VETERINARIAN IF A PET BECOMES SICK FOLLOWING A VISIT TO A PLAGUE AREA.

Animals That Carry Plague

Do not bring fleas home with you!  Flea control products should be used on pets before taking them to a known plague location.  The most important wild rodents that can carry the disease are ground squirrels, chipmunks, wood rats and mice. Rabbits, carnivores and wild pigs can also get plague but usually recover. Domestic animals, such as cats and rats can also carry plague and pose a direct threat to humans.

 

Magnified Flea with Plague Mass


Exposure To Plague- How You Get It

People can get the disease from animals in several ways. The most important routes of transmission are:                                                            

  1. Flea bites from infected rodents:  Hungry fleas will leave a sick or dead rodent to find new blood meals from humans.

  2. Direct contact with sick or dead animals:  The plague bacteria in the blood, urine or saliva of an infected animal can enter cuts and abrasions on human hands.

  3. Pet involvement: (1.) Infected rodents fleas can be brought into a home or campsite by a dog or cat.  (2.) Plague pneumonia can be transmitted by a sick cat that is coughing and sneezing.

General Precautions:

  • Avoid known plague areas
  • Avoid contact with wild animals and their fleas, especially sick or dead rodents
  • Use caution when handling a sick pet that has been in a plague area
  • Avoid face-to-face contact with sick pets or sick humans
  • Report sick or dead animals to park rangers or the Vector Control Program
  • Contact a physician immediately if you become ill within 7 days after being in a plague area 
     

Controlling Plague

  • State and local vector control programs monitor plague activity. Rangers, park employees are trained to watch for sick or dead rodents.            
  • Warnings will be posted by park rangers or health officials in areas where plague is found.  People should use caution when entering these areas.
  • Flea powder may be used to control fleas carrying plague. Flea powder is applied into rodent burrows (rodents get the powder in their fur after entering their burrow, killing fleas inside the burrow). This is very effective, uses a minimum of flea powder and does not harm rodents.

 

 

2014 Plague Activity

Date Community Area Location Species
07/15/2014 Palomar Camp Palomar Otospermophilus beecheyi
07/15/2014 Palomar Camp Palomar Otospermophilus beecheyi
07/15/2014* Palomar Camp Palomar Otospermophilus beecheyi
07/15/2014* Palomar Camp Palomar Otospermophilus beecheyi
07/15/2014 Palomar Cedar Grove Campground Otospermophilus beecheyi
07/15/2014* Palomar Cedar Grove Campground Otospermophilus beecheyi
07/15/2014 Palomar Fry Creek Campground Otospermophilus beecheyi
07/15/2014 Palomar Doane Valley Campground Otospermophilus beecheyi
07/15/2014 Palomar Doane Valley Campground Otospermophilus beecheyi
06/30/2014 Palomar Camp Palomar Otospermophilus beecheyi
06/30/2014 Palomar Camp Palomar Otospermophilus beecheyi

*Denotes the re-capture of a previously tested positive squirrel.

2013 Plague Activity

Date

Community Area

Location

Species

09/17/2013*

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

09/17/2013

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

09/17/2013

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

06/13/2013

Palomar

Fry Creek

Otospermophilus beecheyi

06/12/2013

Palomar

Doane Campground

Otospermophilus beecheyi

06/12/2013

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

06/12/2013

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

05/09/2013

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

*Denotes the re-capture of a previously tested positive squirrel.

2012 Plague Activity

Date

Community Area

Location

Species

07/26/2012

Palomar

Doane Campground

Otospermophilus beecheyi

07/25/2012

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

07/25/2012

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

04/12/2012

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

2011 Plague Activity - none to report

2010 Plague Activity

Date

Community Area

Location

Species

05/06/2010

Palomar

Doane Campground

Otospermophilus beecheyi

2009 Plague Activity

Date

Community Area

Location

Species

06/11/2009

Palomar

Doane Campground

Otospermophilus beecheyi

06/11/2009

Palomar

Doane Campground

Otospermophilus beecheyi

04/02/2009

Palomar

Doane Campground

Otospermophilus beecheyi

2008 Plague Activity

Date

Community Area

Location

Species

10/22/2008

Palomar

Doane Campground

Otospermophilus beecheyi

10/22/2008

Palomar

Doane Campground

Otospermophilus beecheyi

09/24/2008

Palomar

Doane Campground

Otospermophilus beecheyi

08/04/2008

Palomar

Cedar Grove Campground

Otospermophilus beecheyi

07/18/2008

Palomar

Doane Campground

Otospermophilus beecheyi

07/15/2008

Palomar

Doane School Camp / Palomar Mtn.

Otospermophilus beecheyi

06/26/2008

Palomar

Doane Campground

Otospermophilus beecheyi

06/05/2008

Palomar

Doane Campground

Otospermophilus beecheyi

06/05/2008

Palomar

Doane Campground

Otospermophilus beecheyi

Plague Activity Map (2008 through 2011)

Last Updated: August 21, 2014

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For More Information On
Plague Or Other Vectors Contact:
(858) 694-2888
vector@sdcounty.ca.gov