A study reported in CDC MMWR "found that 1,328 accidental poisonous mushroom ingestions were treated in emergency departments during 2016, and during 2016–2018 serious adverse outcomes occurred in 8.6% (48 of 556) of patients who sought care for accidental poisonous mushroom ingestions" where consumption of the foraged mushrooms for were for food or hallucinogenic purposes.
"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"
"This analysis demonstrates the potential for serious adverse outcomes in young children, although they occurred less frequently than in older persons. Young children might take small, exploratory bites of mushrooms during outdoor play. " Adults often consumed larger quantities, either as food or for hallucinogenic effect.
We normally do not see many of these cases in the press, so at least for me, this number is a lot larger than I would have expected.
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.