
San Francisco Chronicle: Why Sick Sea Lions are Washing Up on the California Coast
- Leptospirosis
Published in the San Francisco Chronicle: September 9, 2023
Experts are warning Bay Area residents to not to approach sea lions as a potentially deadly bacterial infection wracks the local population.
Sea lions that seem tired or that tuck their flippers into their sides might be suffering from leptospirosis — a bacterial infection that can cause irreversible kidney damage in California sea lions, as well as humans and dogs, according to the Marine Mammal Center and the Centers for Disease Control.
The Marine Mammal Center typically sees an outbreak of the disease every four to five years, though this is not one of those years, according to Giancarlo Rulli, public relations manager for the center.
Yes, I want to save a life!

Yes, I want to save a life!
You’ll be giving sick and injured animals the best possible care at the Center’s state-of-the-art hospital. With your gift today, you are giving a patient a second chance at life in the wild.
See Our Latest News
{"image":"\/People\/Action\/Response\/cropped-images\/mbo-crew-es-rope-rescue-photo-by-lesley-simms-c-the-marine-mammal-center-2-0-0-1270-992-1749571082.jpg","alt":"MBO crew carrying a crate up a cliff","title":"The Marine Mammal Center reports high levels of marine mammal disturbance in Central and Northern California for third year in a row","link_url":"https:\/\/www.marinemammalcenter.org\/news\/the-marine-mammal-center-reports-high-levels-of-marine-mammal-disturbance-in-central-and-northern-california-for-third-year-in-a-row","label":"Press Release","date":"2025-06-10 02:00:00"}

The Marine Mammal Center reports high levels of marine mammal disturbance in Central and Northern California for third year in a row
June 10, 2025
Read More{"image":"\/Animals\/Wild\/Elephant seal\/cropped-images\/elephant-seal-mom-and-pup-photo-c-brian-simuro-156-0-1270-992-1748974858.jpeg","alt":"Northern elephant seal and pup","title":"The New York Times: Racing to Save California\u2019s Elephant Seals From Bird Flu","link_url":"https:\/\/www.marinemammalcenter.org\/news\/the-new-york-times-racing-to-save-californias-elephant-seals-from-bird-flu","label":"In the News","date":"2025-06-03 02:00:00"}

The New York Times: Racing to Save California’s Elephant Seals From Bird Flu
June 3, 2025
Read More{"image":"\/Animals\/Wild\/Gray whale\/cropped-images\/a-dead-gray-whalesf-bay40225photo-c-the-marine-mammal-center-53-0-1270-992-1748642560.jpg","alt":"a dead gray whale in the water with birds flying above","title":"NBC News: Six dead gray whales found in San Francisco Bay area in the last week","link_url":"https:\/\/www.marinemammalcenter.org\/news\/nbc-news-six-dead-gray-whales-found-in-san-francisco-bay-area-in-the-last-week","label":"In the News","date":"2025-05-29 02:00:00"}

NBC News: Six dead gray whales found in San Francisco Bay area in the last week
May 29, 2025
Read More{"image":"\/Animals\/Patients\/Elephant seals\/cropped-images\/es-hoffman47927-photo-by-bill-hunnewell-c-the-marine-mammal-center-124-0-1270-992-1748384535.jpg","alt":"An An elephant seal\u2019s face with long black whiskers and wide eyes emerges from the water. ","title":"Adaptations of the Deep: Seal Whiskers and Eyes","link_url":"https:\/\/www.marinemammalcenter.org\/news\/adaptations-of-the-deep-seal-whiskers-and-eyes","label":"Patient Update","date":"2025-05-28 02:00:00"}

Giancarlo Rulli
California Sea Lion