Morel of the Story: Raw Mushrooms Can Be Deadly

By Jimmy Daoutis, Founder of AdvancedMycoTech · Last updated: March 2026

Introduction

In a tragic incident, more than 50 individuals became ill, and two people died after consuming morel mushrooms at Dave’s Sushi in Bozeman, Montana. This outbreak, which occurred between March 28 and April 17, 2023, has raised serious concerns about the preparation and consumption of morel mushrooms, which are typically considered a delicacy when cooked properly.

Background on Morel Mushrooms

Description and Edibility

Morel mushrooms are known for their unique honeycomb-like appearance and are highly prized in culinary circles. They must be thoroughly cooked to eliminate toxins, as consuming raw or undercooked morels can lead to severe gastrointestinal distress and other health issues.

The Recent Incidents

The Outbreak at Dave’s Sushi

Health officials reported that the morel mushrooms served at Dave’s Sushi during the implicated period were either raw or only lightly cooked. This improper preparation was identified as the likely cause of the illnesses and fatalities. Patrons who consumed these mushrooms experienced symptoms such as diarrhea, nausea, vomiting, and abdominal pain within hours of their meal (DPHHS) (Food Safety News).

Investigation and Findings

The investigation involved the Montana Department of Public Health and Human Services (DPHHS), the Gallatin City-County Health Department (GCCHD), the Centers for Disease Control and Prevention (CDC), and the U.S. Food and Drug Administration (FDA). They conducted extensive interviews and laboratory tests, identifying the species of morel mushrooms as Morchella sextelata, a type of true morel. Despite thorough testing, no specific toxin or pathogen was definitively identified, pointing to gaps in scientific understanding of morel mushroom toxicity (Food Safety News) (Food Poisoning News).

Response from Health Authorities

Public Safety Measures

In response to the outbreak, public health officials have emphasized the importance of proper handling and thorough cooking of morel mushrooms. They recommend that individuals avoid consuming morels unless they are confident in their preparation techniques. Additionally, they advise seeking immediate medical attention if symptoms develop after consuming morels (DPHHS) (Food Poisoning News).

Recommendations for Mushroom Handling

For those who forage or purchase morel mushrooms, the following guidelines are recommended:

Ensure proper identification of morel mushrooms, consulting experts if necessary.
Store morels at a temperature of 40°F or below in breathable packaging like paper bags.
Cook morels thoroughly, avoiding raw consumption altogether.

Conclusion

The deaths linked to undercooked morel mushrooms at Dave’s Sushi highlight the critical importance of proper mushroom preparation. While morels can be a delicious addition to meals, they require careful handling and cooking to prevent serious health risks. Public health authorities continue to investigate and provide guidelines to ensure such incidents do not recur, stressing the need for caution and education in the handling of wild mushrooms.

For more detailed information, you can read the final summary from the Montana Department of Public Health and Human Services here.