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Increase in Leptospirosis Disease in Sea Lions

October 27, 2008
The Marine Mammal Center
The Marine Mammal Center has seen an increase in leptospirosis cases in sea lions this year. Researchers there are launching a new study to determine causes of cyclical outbreaks and how the disease is spread among sea lions.

The Marine Mammal Center in Sausalito, Calif., inches a special net close to capture wild California sea lions. Before releasing the animals back to the ocean, veterinarians will collect blood samples and other data as part of a study to learn more about leptospirosis.
Credit: The Marine Mammal Center, NOAA Permit No. 932-1489-10

The Marine Mammal Center is seeing a large number of leptospirosis cases in California sea lions this year and is leading a study to determine when and why the sea lions contract this disease. Every four to five years, the Center sees a surge in the number of sea lions admitted as a result of this bacterial infection that affects the kidneys and can be lethal for patients.

The current research will focus on the factors contributing to these cycles of disease so that scientists will have an understanding of how the disease spreads and what the risks are to sea lions and other animals. Recently, the Center began taking blood samples, tagging, and releasing wild juvenile California sea lions in the Bay Area as part of the new research study.

"The blood samples our team will collect from wild California sea lions will help them determine kidney function and exposure rates among these animals," said Dr. Jeffrey Boehm, Executive Director at The Marine Mammal Center. "The data will also help us understand more about the susceptibility of sea lions in the population during an epidemic and clarify the relationship between the stranded sea lions with leptospirosis we see here at the Center and those that are susceptible in the population."

Leptospirosis epidemics were first documented in California sea lions in the early 1970s and are caused by spiral shaped bacteria called leptospires. Many different animal species, including humans, carry the bacterium which can leech into water or soil and survive there for weeks to months. Humans and animals can become infected through contact with contaminated urine, water, or soil. If not treated, the patient can develop kidney damage, meningitis, liver failure, and respiratory distress. The Marine Mammal Center advises beach goers and their dogs to stay away from marine mammals they may encounter on beaches and to call the Center's 24-hour response line at (415) 289-SEAL should they come across any marine mammal in distress.

Collaborators in this new study include the National Oceanic Atmospheric Administration, University of California Los Angeles, University of California at Davis, Penn State University and the National Animal Disease Center in Ames, Iowa.

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The above post is reprinted from materials provided by The Marine Mammal Center. Note: Materials may be edited for content and length.

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The Marine Mammal Center. "Increase in Leptospirosis Disease in Sea Lions." ScienceDaily. ScienceDaily, 27 October 2008. <>.
The Marine Mammal Center. (2008, October 27). Increase in Leptospirosis Disease in Sea Lions. ScienceDaily. Retrieved November 29, 2015 from
The Marine Mammal Center. "Increase in Leptospirosis Disease in Sea Lions." ScienceDaily. (accessed November 29, 2015).

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