Public Health

The Mono County Health Department provides environmental and public health services that support the health and safety of Mono County residents and visitors.

Please click on one of our programs to the left for more information, and some highlights are listed below.

If you are interested in receiving important health information such as MonoGrams, flu clinic schedules and community events, please sign up for Public Health Updates on the left side of this page and find us on Facebook!

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Mono County Reports Second Fatality Due to Hantavirus

MONO COUNTY, Calif. (March 26, 2025) – Mono County Public Health has confirmed a second death related to Hantavirus in the Town of Mammoth Lakes. Hantavirus is a serious and often fatal illness spread primarily through contact with infected deer mouse droppings, urine, or saliva. Deer mice are widespread in the Eastern Sierra region. 

Hantavirus is endemic to Mono County and the surrounding region, commonly found in local deer mice. Human infection occurs through exposure to contaminated rodent droppings, urine, or saliva, typically when these materials become airborne and are inhaled. Person-to-person transmission does not occur.

For information on Hantavirus prevention, see here: Hantavirus

Avian Influenza (H5N1) Update

• Widespread H5N1 influenza infection in California’s dairy cattle and increasing infections in poultry flocks.
• Numerous jurisdictions, including Town of Mammoth Lakes, with recent H5N1 detections in wastewater.
• California recently reported first pediatric case, mild disease in a child in Alameda County (child may not have had any contact with farm animals).
• H5N1 detected in a single bottle of Raw Farm dairy raw milk (limited product recall).