California issues a warning as mushroom poisonings surge
A growing number of poisonings linked to wild mushrooms foraged in California has prompted health officials to urge residents to steer clear of mushroom foraging. The alert follows a spike in amatoxin-related illnesses, including one confirmed adult death, associated with toxic varieties that can closely resemble edible species. The California Department of Public Health (CDPH) confirmed the uptick after data from the California Poison Control System (CPCS) showed more cases.
As of December 5, CPCS documented 21 cases, with clusters identified in Monterey and the San Francisco Bay Area and additional cases appearing elsewhere in the state. Patients range from children to adults, and several cases have required intensive care. At least one individual may need a liver transplant, CPCS indicated. An adult fatality has been verified.
State Public Health Officer Dr. Diana Pan warned that mushrooms containing amatoxins, especially the death cap (Amanita phalloides), are extremely dangerous because they often look like safe, edible varieties.
“Death cap mushrooms carry toxins that can cause life-threatening liver failure,” Pan stated in the advisory. She noted that these mushrooms are easy to mistake for edible ones, prompting officials to recommend avoiding foraging entirely during this high‑risk season.
Experts emphasize that cooking, boiling, drying, or freezing does not neutralize the toxins in poisonous mushrooms. Early symptoms—such as vomiting, diarrhea, nausea, and abdominal pain—can appear within 6 to 24 hours after ingestion and may briefly subside, giving a misleading impression of recovery. However, severe liver damage can develop 48 to 96 hours after consumption, even if symptoms improve temporarily.
Officials link the rise in poisonings to seasonal rains, which create favorable conditions for death caps to grow, particularly around oak and other hardwood trees throughout California.
Public guidance remains clear: avoid all foraged wild mushrooms and rely only on mushrooms purchased from reputable, commercial sources.
Healthcare providers are urged to stay vigilant for signs of mushroom toxicity. CPCS can offer diagnostic and treatment guidance at 1-800-222-1222.
Additional information is available through the California Poison Control System and the CDPH website for poisonous mushrooms.
