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Mono County health officer reports cluster of three hantavirus deaths in Mammoth Lakes; expands outreach and screening

Mono County Board of Supervisors · April 8, 2025
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Summary

Mono County Health Officer Dr. Tom Boo told the Board that three residents of Mammoth Lakes recently died of hantavirus; county public health is increasing outreach, training hospital labs on a five-point screening test and advising people to ventilate and use N95 respirators for high-risk indoor cleanups.

Dr. Tom Boo, Mono County's public health officer, told the Board of Supervisors the county has identified a cluster of three confirmed hantavirus pulmonary syndrome deaths in Mammoth Lakes with illness onsets in February. "We recently lost three Mammoth Lakes community members to hantavirus," Boo said, noting that hantaviruses in North America are carried by deer mice and that infections are most often linked to inhalation of aerosolized mouse waste indoors.

Boo said the county has not had a case since 2019 until this cluster and that Mono County's historical case count is notable: "Mono County's 207 cases over 32 years constitute about one third of state cases despite having only…

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