updated 12/28/2010 6:26:44 PM ET 2010-12-28T23:26:44

An outbreak of salmonella that was tied to tainted alfalfa sprouts has grown to at least 94 cases in 16 states.

The U.S. Centers for Disease Control and Prevention on Tuesday said the case count had risen from 89 cases in 15 states in the past week, with California joining the list.

More than half the cases have been in Illinois. There have been no deaths.

The U.S. Food and Drug Administration advised the public not to eat alfalfa sprouts produced by the Tiny Greens Organic Farm in Urbana, Ill., because of possible salmonella contamination. The warning issued Monday evening also includes a mix called spicy sprouts, which contains radish and clover sprouts.

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Video: Salmonella outbreak sickens 94 people

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    >>> 16 states have gotten sick from eating tainted alfall fa sprouts. government investigators think the salmonella outbreak stems from an organic farm in illinois called tiny greens. dr. claudia hoyen is an infectious disease physician at uh case medical center in cleveland. tell me about the kinds of symptoms people will experience if they have contracted salmonella .

    >> inthithe things that people will notice if they have salmonella , they may have fever initially. they might have some vomiting and diarrhea. eventually they may actually see some blood in their stool. and if you're a normal host, meaning that there isn't anything wrong with your immune system, it will last between four and five days. and then the symptoms will resolve. the time that we worry about salmonella is in little kids, so typically -- especially children under a year. and also in the elderly people . they may have prolonged symptoms or have other complications from the salmonella in terms of it getting into their blood stream and infecting their body.

    >> tell me about these alfalfa sprouts. when you think of salmonella , there's a lot of foods that come to mind. you know, raw eggs, that kind of thing. are sprouts a typical culprit?

    >> i think that they have been related to outbreaks in the past. but pretty much any type of fresh food that you eat or also like eggs, if you don't cook them well enough, if there is salmonella perhaps in the water supply that they've used or if they somehow get contaminated during the picking or during the packaging or things can even happen post-market as well. if it's a food that is not cooked, that's when you're at risk for getting it, if it happens to be on that food that you've chosen.

    >> dr. hoyen, thank you for joining us. we appreciate your expertise. i just want to mention that the alfalfa sprouts apparently were distributed through a sandwich chain called jimmy john's, which is primarily in the midwest, which is why a lot of the states affected have been in the midwest. so, again, it came from a place called tiny greens farm . they were organic alfalfa sprouts.

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