California health officials gave a warning in early December after people became sick from wild mushrooms in different parts of the state. One person suffered a fatal outcome, and several others became seriously ill. The poison control system reported 21 cases of amatoxin poisoning. These cases were probably caused by death cap mushrooms picked in public places, including a park in Monterey County. More cases were also found in the San Francisco Bay Area, which showed that the danger was spread across the state. Officials said that wet weather helped mushrooms grow fast, making it easier to confuse dangerous mushrooms with safe ones. The warning explained that death cap mushrooms have strong toxins that can cause liver failure.

Experts explained why the poisonings happened and why the risk is still high in winter. Health officials said that poisonous mushrooms often look like edible mushrooms, so people can make mistakes. Specialists also said that early symptoms like nausea and vomiting may get better for a short time, even when serious damage is still happening inside the body. National data from 2023 showed more than 4,500 cases of exposure to unknown mushrooms. Officials warned that children are at higher risk because they may touch or eat mushrooms while playing. The warning advised people to get medical help quickly in suspected poisoning cases.