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Whales in San Francisco Bay

Roughly 30 gray whales have been spotted in the Bay this season, many more than is typical. Sadly, there have also been at least 14 deaths this year, which is more than in all of 2024. 

We are investigating to help determine the cause of these deaths. By gaining insights into what is causing these tragedies, we can better understand how to help prevent them.

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gray whale fluke
sea otter floating on its back

Novel Presentation of Coccidioidomycosis (Valley Fever) in a Southern Sea Otter

Novel Presentation of Coccidioidomycosis with Myriad Free-Floating Proteinaceous Spheres in the Pericardial Sac of a Southern Sea Otter (Enhydra lutris nereis)
  • Infectious disease
  • Climate change

Abstract

A southern sea otter (Enhydra lutris nereis) stranded dead in central California, USA, with a distended pericardial sac containing thousands of free-floating proteinaceous masses. Serology, fungal culture, PCR, and sequencing confirmed the etiology of this novel lesion as Coccidioides immitis. Range expansion of this zoonotic pathogen is predicted with climate change.


Harris, H.S., Harris, M.D., Thompson III, G.R., Engelthaler, D.M., Montfort, P.L., Leviner, A.L. and Miller, M.A., 2023. Novel Presentation of Coccidioidomycosis with Myriad Free-Floating Proteinaceous Spheres in the Pericardial Sac of a Southern Sea Otter (Enhydra lutris nereis). Journal of Wildlife Diseases.

infectious disease
climate change
Heather S. Harris

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