"Adverse outcomes from poisonous mushroom ingestions might occur because amateur mushroom foragers might not distinguish poisonous from nonpoisonous species (2). Recent immigrants are also at risk for mushroom poisonings because they might mistake poisonous mushrooms for nontoxic varieties found in other countries (4). Accidental mushroom poisoning diagnoses were more common in the summer and most frequently occurred in the western United States; this might reflect regional differences in the popularity of recreational mushroom foraging or the fact that Amanita smithiana, a potentially deadly and easily misidentified mushroom species that causes gastrointestinal symptoms followed by acute renal failure, is more common in this region"
https://www.cdc.gov/mmwr/volumes/70/wr/mm7010a1.htm
Health Care Utilization and Outcomes Associated with Accidental Poisonous Mushroom Ingestions — United States, 2016–2018
Weekly / March 12, 2021 / 70(10);337–341
Jeremy A.W. Gold, MD1,2; Emily Kiernan, DO3,4; Michael Yeh, MD3,4; Brendan R. Jackson, MD2; Kaitlin Benedict, MPH2
Summary
What is already known about this topic?
Poisonous mushroom ingestions can result in serious illness and death. The national prevalence of health care use associated with accidental poisonous mushroom ingestion is unknown.