define "riskiest"

I'm going to guess that reporter ad libbed the sloppy language describing this study as describing "riskiest" foods rather than foods most likely to carry pathogens. It would be odd to call leafy greens the "riskiest" food in America without considering the "risk" of heart disease from consumption of partially hydrogenated soybean oil, meats, and dairy, or the risk of obesity, diabetes, and tooth decay from high fructose corn syrup. I bet a lot more people every year get sick and die from cheeseburger-induced heart disease than e. coli from spinach.

It's ill-considered language like this that gives fish a bad rep. Our eating habits are bad enough without irresponsible reporters telling people that leafy greens, tuna, tomatoes, sprouts, and berries are dangerous.