WASHINGTON -- The nasty form of E. coli hitting Europe points out gaps in the U.S. food safety system that raise concern that similar outbreaks might happen here.

It's impossible to test for every illness-causing form of E. coli, even the kinds we already know about.

Today, the food industry and health authorities focus mostly on a single strain of the bacteria that until now was considered the most dangerous. But some different strains collectively known as "the other E. colis" were sickening more and more people well before this extra-deadly European bug burst on the scene.

"It's a wake-up call around the world," said Dr. Robert Tauxe of the Centers for Disease Control and Prevention, which has long been concerned about the lesser known strains.

Authorities don't yet know the source of the European infection, but cucumbers, tomatoes and leafy lettuce grown there are suspected.

There's no reason to stop eating fresh vegetables in the United States, but officials are monitoring the situation carefully. The Food and Drug Administration has stepped up testing of those foods imported from affected countries as a precaution, although very little is imported.

And Agriculture Secretary Tom Vilsack said Thursday there's no immediate threat from what's happening in Europe. "We have to constantly look for ways to improve food safety, and that requires us to make sure that we're testing for the right things," he said.

USDA, under pressure from consumer groups, already was working on a measure to address some of the other E. colis in beef, a policy being reviewed by the Obama administration. Researchers created tests to screen for the six strains considered most prevalent, before the toll in Europe revealed a seventh.

When it comes to fresh produce, a sweeping new law requires the FDA to set standards to guard against contamination of all sorts. The rules are expected to address such things as properly processed compost, worker hygiene, and keeping animals and their runoff from fields or irrigation water.

It's not clear how quickly those rules will emerge; Republican-led efforts to cut FDA's budget would strain the work.

"There are no regulations in place today that would prevent this kind of outbreak from occurring" in the U.S., said food-safety expert Caroline Smith DeWaal of the Center for Science in the Public Interest.

But specialists say the broad focus promised by the food-safety law is critical to get ahead of the next emerging germ, rather than racing to develop tests for each new strain.

"You never know what's around the corner that's just waiting to bite you," said former FDA assistant commissioner Dr. David Acheson, now a food-safety consultant. "You cannot test your way to safety, you just can't do it."

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