The number of people infected in a multistate salmonella outbreak has reached 100, but federal officials said Friday that they haven't conclusively identified the cause.

The Centers for Disease Control in Atlanta said 10 people have been hospitalized and that no deaths have occurred. The illnesses in 19 states plus the District of Columbia mostly involved people who had recently eaten sushi, sashimi or related types of foods, the CDC said.

But health officials in New York state said it is too soon to peg sushi as the culprit, because not all of the 23 people there who became infected had eaten such raw-fish products. The illnesses involved an unusual strain of the bacteria, known as salmonella Bareilly.