and that doesn't sit well with kevin mcdermott. >> i don't know about that.unds a little shady to me. >> reporter: why? >> because we should be informed. if there is a deadly bacteria that can actually kill people, then you should be informed right away. >> reporter: and chris freights is in grand rapids, michigan, outside of the hospital where kevin mcdermed was treated. you heard him talking about the usda regulations that he doesn't agree with that prevent the naming of the restaurants involved. what is the rationale behind this? >> well, i tell you, brianna, the usda officials i talked to say they're focused on getting this bad meat out of circulation. and unlike consumers who buy their meat at the grocery store and might put it in the freezer and serve it later, restaurants aren't going to serve recalled meat. and they're worried if they start naming restaurants, then in the future the restaurant industry will be much less likely to cooperate with their investigations. >> chris frates in grand rapids, thanks. >>> "outfront" tonight, dr. sanjay gupta. san

. >> reporter: 11 people in four states have been hospitalized, including kevin mcdermott of grand rapids. >> i didn't have a clue what was going on. i've never been sick like that before in my life. >> reporter: while no product tested positive, wolverine says it was prudent to voluntary recall the beef. at first, it was thought the suspect meat was delivered primarily to restaurants, but the expanded recall includes several grocery chains, which means those planning to dust off grills this holiday weekend, should be aware of where their meat comes from and how it's cooked. >> reporter: doctors say ground beef should be cooked to at at least 160 degrees, if not well done. >> because undercooked beef is where people get into trouble. >> yeah, i definitely make it well done. >> reporter: a second recall is underway for hummus dip that may contain listeria and sold by target, giant eagle and trader joes across the country. as memorial day roms around, the medical advice is to check the labels and cook your meat. >> i'd rather be safe than sorry. >> reporter: to help keep the sizzle in your

. >> reporter: kevin mcdermott thinks he is one. diagnosed with the same strain of e. to spend ten days in the hospital. describing the pain. >> hot knife in your guts or battery acid. >> reporter: it can take up to ten days before symptoms appear and not only can it make you sick for a full week it can lead to kidney failure and even death. did you eat or buy the bad beef? the federal government is investigating. it's going to disclose any names of retailers impacted but they are going through reams of paper trying to sort out where it went. >> no one mentioned what restaurants. >> yes, that's right. that's right. no one has mentioned the restaurants yet. >> reporter: why is that? there could be people out there who ate there and were sick but don't realize they could have a serious infection. >> i think those people will eventually know. >> reporter: doesn't the public have a right to know what restaurants serve this beef? >> they will know at some point where the meat was distributed. 11 illnesses is 11 too many in my book but we did prevent a larger recall by our q