As smears go, this was a nasty one. When health officials announced three weeks ago the outbreak of a rare gastrointestinal illness in 10 U.S. states and Canada, they fingered fresh strawberries as the likeliest source of the bug--and promptly turned a favorite summer fruit into a culinary pariah. Now, however, it looks as if strawberries may have gotten a bum rap. Investigators still haven't located the infectious microbe outside its human hosts, but the intensifying search has come up with a new and equally delectable prime suspect: fresh raspberries.
What has prevented researchers from identifying a culprit more conclusively, they...
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