Mariposa County Sheriff Jeremy Briese, in
a monthly update last week, said some test results from recent water samples there came back showing “high levels” of anatoxin-a, but that investigators are “not saying” that’s what killed Mariposa residents John Gerrish, Ellen Chung, their daughter, Miju, and family dog, Oski.
Despite the presence there of anatoxin-a, the State Water Board said it’s continuing to recommend a caution advisory in that location, near where the family was found dead,
which is two tiers below the state’s most serious danger advisory.
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Multiple types of cyanobacteria were detected” in algal mats there, the results state, along with anatoxin-a at 11.8 micrograms per liter.
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No other cyanotoxins were detected (I.e. microcystins, cylindrospermopsin, saxitoxin),” the results posted Wednesday continue.
The sheriff’s office said there was no new information to share Wednesday about the mysterious death case.
A Sierra National Forest spokesperson on Tuesday said just that the hazards are “still under investigation.” The agency has not answered questions about the size of the known harmful algae bloom on the south fork of the Merced River, or if there are others in Sierra National Forest.
The results of toxicology tests for the Mariposa family have not been shared.
In response to a question during last Thursday’s sheriff update, about whether toxicology results were back yet, Briese said, “Some are, yes. But we still do not have an exact cause of death yet.”
In response to another question, Briese said he hadn’t heard of any livestock dying from harmful algae in Mariposa County, but the recent tests from Devil’s Gulch showed that “the levels were high,
especially dangerous for animals.”
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