19 yo male with diarrhea, severe chills, fever, headache. Was outside skateboarding in the heat this afternoon. Also had a sub sandwich from the shop -- we noticed they were cleaning deli cases and mayo could have been left out. Symptoms developed about 4 hours after eating.I gave him 1 liter of powerade, 2 tylenol. Symptoms have subsided, but he complains of sensitive skin, and has red, bloodshot eyes and malaise.