Many people are now questioning the source of a parasite that's responsible for the illnesses of hundreds of people in the U.S. across at least 16 states.

Officials in two states believe the parasite is linked to a pre-packaged salad mix, but others aren't so sure that's the cause. 

Enticing Illegal Immigration? Gov't Ad Promotes Food Stamps

Dr. Marc Siegel told Shannon Bream on Friday's America Live that government organizations are part of the problem, because different organizations oversee agriculture versus the packaged vegetable products themselves.

"There's a gap in food safety between the USDA and the FDA," he said. 

Is $600M Lux Hollywood Hotel Right Above Active Fault Line?

One bit of good news, he said, is that it's not transferrable from person to person. Rather, it lives in the environment - on fruit and vegetables, for example - before becoming infectious. Then, it lodges in the small intestine, creating flu-like symptoms.

Get more insight in the segment below, and don't miss Dr. Siegel every Sunday at 10:30a ET on Housecall!

AG Says No to Ark. Schools' Plan to Arm Teachers