Double Hamburger Illness - In-N-Out, Upland California

1837 Foothill Boulevard, Upland, 91786 California, United States

Suspected food poisoning. Symptoms: Diarrhea, Nausea, Fever, Stomach Pain, Chills, Headache
Suspected source: hamburger, either the patty or the lettuce
Onset: 1 to 2 days
Duration: Several days
Additional information: Both my roommate and I had hamburgers on 3/3, he started feeling nauseous on Saturday morning (3/4). I got sick shortly after he did, it's now lasted over 48 hours. lots of nausea and headaches and diahhrea. | Symptoms: Diarrhea, Nausea, Fever, Stomach Pain, Chills, Headache