Food Safety Report: Kungsbackaskogen, Kungsbacka, Sweden 3 years ago • details 1 Comments Comment Suspected food poisoning. Symptoms: Diarrhea,Nausea,Fever,Stomach Pain,Chills Suspected source: mushroom Onset: 4-8 hours Duration: not sure Sick: 1 Additional information: Karl Johan mushroom, edible, but not cooked.