WASHINGTON—The Center For Disease Control and Prevention of the US Department of Health and Human Services is collaborating with public health officials in many states, the Indian Health Service, and the US Food and Drug Administration (FDA) to...

WASHINGTON -- Federal health officials have learned of 106 more cases of salmonella linked to tainted tomatoes, putting the outbreak's toll at 383 on Wednesday and counting.

"We do not think the outbreak is over,'' said Dr. Robert Tauxe of the Centers for Disease Control and Prevention.

Most of this newest influx of cases were people who got sick weeks ago but hadn't been counted yet. Some states began doing a better job of checking for salmonella as the outbreak has dragged on, while part of the surge comes from test results that had been backlogged in jammed laboratories.

What hasn't changed is that the earliest known victim got sick on April 10, and the latest on June 5.

But New Hampshire and Pennsylvania reported their first cases, bringing to 30 the number of states -- plus Washington, D.C. -- that have reported sick residents, although some may have been infected while travelling. At least 48 people have been hospitalized.

It might be impossible to trace the ultimate source of the tainted tomatoes, the Food and Drug Administration's food safety chief warned Wednesday.

"I know there is a great deal of frustration'' that the mystery hasn't been solved, said Dr. David Acheson, the FDA's associate commissioner for foods. "We're continuing to work flat-out.''

But tomatoes are among the hardest foods to trace in an outbreak, because people seldom have any left by the time...
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