Unusually High Number of Death Cap Mushroom Poisonings Reported in California

Multiple liver transplants and deaths linked to mistaken consumption of deadly mushrooms

Published on Feb. 9, 2026

Got story updates? Submit your updates here. ›

Since November 18, there have been more than three dozen cases of death cap mushroom poisonings reported in California, including four deaths and three liver transplants. Many who sought medical attention suffered from rapidly evolving acute liver injury and liver failure, requiring intensive care treatment. Experts say warm fall temperatures and early rains have led to an unusually large growth of the deadly mushrooms this year.

Why it matters

Death cap mushrooms are one of the most poisonous mushrooms in the world, and can be easily mistaken for edible varieties. Ingesting even a small amount can lead to liver failure and death if not treated quickly. The spike in poisonings highlights the need for greater public awareness about mushroom identification and the dangers of foraging for wild mushrooms without expert guidance.

The details

According to the California Poison Control System, in a typical year there are between two and five death cap poisonings reported. However, the number of cases this year is nearly 40, which is described as "very unusual." Experts attribute the spike to warm fall temperatures and early rains leading to a "super bloom" of the deadly mushrooms. Several patients required admission to intensive care units after suffering from rapidly evolving acute liver injury and liver failure.

  • Since November 18, 2026, there have been more than three dozen cases of death cap mushroom poisonings reported.

The players

Dr. Craig Smollin

Medical director for the San Francisco Division of the California Poison Control System.

Got photos? Submit your photos here. ›

What they’re saying

“The main thing this year is just the magnitude, the number of people ingesting this mushroom. Having almost 40 is very unusual.”

— Dr. Craig Smollin, Medical director, California Poison Control System (resetera.com)

What’s next

Experts warn that the death cap mushroom season is likely to continue, and urge the public to be extremely cautious when foraging for wild mushrooms. They recommend consulting with a mycologist or other expert before consuming any unfamiliar mushrooms.

The takeaway

This spike in death cap mushroom poisonings underscores the critical importance of public education about mushroom identification and the dangers of consuming wild mushrooms without expert guidance. It serves as a stark reminder of the potentially deadly consequences of mistaking toxic mushrooms for edible varieties.