This morning i had a mcdonalds and in the chicken sandwhich there was mayonaise and lettuce. the first bite it tasted a bit sour but the rest were fine. now im really paranoid that im going to get salmonella. i didnt eat the whole burger but i didnt know if it was just the taste of lettuce and mayonaise together i only consumed a small amount of the mayonaise this was about 3 hours ago