The biggest cause of foodborne illness is what bug?

Foodborne illnesses: Each locale has its own "biggest cause of foodborne illness." outbreaks may involve bacteria (salmonella, shigella, c.Perfringens, c.Botulinum, b.Cereus, v.Parahaemolyticus, campylobacter, staph aureus), virus (norwalk, hepatitis a), chemical (ciguatoxin, scobrotoxin, mushrooms, heavy metals), water contamination (giardia, s.Typhi), others. Watch out for "traveller's diarrhea" (especially etec).