Search for an E. coli defense

Barbara and Mike Kowalcyk knew E. coli was a food-borne illness that could make people sick. But the Wisconsin couple were entirely unprepared for what they heard five years ago as their stricken 2-year-old son lay in a hospital bed nearby.

"The doctor sat my husband and I down in this little, tiny waiting room and said, 'Mr. and Mrs. Kowalcyk, we are so sorry -- this is possibly the worst thing that can happen to your child. There is no treatment. There is no cure,' " Barbara Kowalcyk recalled last week. "I could not believe there was nothing they could do. It was horrific."

Their son, Kevin, died of acute E. coli poisoning eight days later, and, true to the doctor's word, there was very little anyone could do.

That could change.

Part of the alarm over cases of E. coli poisoning, such as the current spinach-linked outbreak blamed on the 0 O157:H7 strain, has been the difficulty in treating the most severe cases -- when toxins produced by the bacterium cause kidney failure. But researchers have been working for two decades to learn more about the illness and now think they will eventually have ways to limit the damage.

"There is a tremendous urgency to find treatments," says Dr. Howard Trachtman, a pediatric nephrologist and expert on E. coli at Long Island Jewish Medical Center in New Hyde Park, N.Y. "It's a very serious disease. It affects previously healthy kids, and the morbidity is so high. Three to 5 percent die."

The O157:H7 strain releases a toxin, called Shiga toxin, that attacks the intestines, causing bloody diarrhea and intense cramping. Sometimes the intestines bleed and break down. The toxin also can cause hemolytic uremic syndrome, in which the kidneys shut down due to damage in the small blood vessels. Both complications can be fatal, but kidney failure causes most E. coli-related deaths.

Doctors are essentially helpless to reverse hemolytic uremic syndrome once the process has begun, Trachtman says.

Instead, they try to keep the patient hydrated while providing electrolytes to maintain the body's nutritional balance. Some patients need kidney dialysis, the use of a ventilator, blood transfusions and blood pressure medication to keep them alive while the body fights the infection and toxins.

With enough supportive care, most are able to pull through. The body's immune system fights off the infection, and the kidneys are able to heal themselves. A few patients -- usually children and elderly people, who have weaker immune systems -- are unable to recover.

Most people fare best if they seek medical help quickly and are admitted to a hospital with expertise in treating hemolytic uremic syndrome, says Dr. Phillip Tarr, a professor of pediatrics at Washington University School of Medicine in St. Louis. Tarr treated many of the children who fell ill in 1993 in the Pacific Northwest from E. coli poisoning involving contaminated, under-cooked meat. The O157:H7 strain was also blamed in that outbreak. Much of the current research focuses on intervening earlier in the biological process, before the kidneys fail.

Several research groups are trying to create antibodies to the Shiga toxin, substances that would recognize and help fight the poison.

•	Search for an E. coli defense Weapons of choice include antibodies, biomarkers and early-detection kits Los Angeles Times, Monday, Sept. 25, 2006 Byline: Shari Roan, Times Staff Writer

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