Navigation Links
German E. Coli Strain Especially Lethal, Studies Find

By Steven Reinberg
HealthDay Reporter

WEDNESDAY, June 22 (HealthDay News) -- The strain of E. coli bacteria that this month killed dozens of people in Europe and sickened thousands more may be more deadly because of the way it has evolved, a new study suggests.

Scientists say this strain of E. coli produces a particularly noxious toxin and also has a tenacious ability to hold on to cells within the intestine. This, alongside the fact that it is also resistant to many antibiotics, has made the so-called O104:H4 strain both deadlier and easier to transmit, German researchers report.

"This strain of E. coli is much nastier than its [more common] cousin E. coli O157, which is nasty enough -- about three times more virulent," said Hugh Pennington, emeritus professor of bacteriology at the University of Aberdeen in Scotland and author of an accompanying editorial published online June 23 in The Lancet Infectious Diseases.

Another study, published the same day in the New England Journal of Medicine, concludes that, as of June 18, more than 3,200 people have fallen ill in Germany due to the outbreak, including 39 deaths.

In fact, the German strain -- traced to sprouts raised at a German organic farm -- "was responsible for the deadliest E. coli outbreak in history," Pennington said. "It may well be so nasty because it combines the virulence factors of shiga toxin, produced by E. coli O157, and the mechanism for sticking to intestinal cells used by another strain of E. coli, enteroaggregative E. coli, which is known to be an important cause of diarrhea in poorer countries," he said.

Shiga toxin can also help spur what doctors call "hemolytic uremic syndrome," a potentially fatal form of kidney failure. In the New England Journal of Medicine study, German researchers say that 25 percent of outbreak cases involved this complication.

The bottom line, according to Pennington: "E. coli hasn't gone away. It still springs surprises."

To find out how this strain of the intestinal bug proved so lethal, researchers led by Dr. Helge Karch from the University of Munster studied 80 samples of the bacteria from affected patients. They tested the samples for shiga toxin-producing E. coli and also for virulence genes of other types of E. coli.

That's when they uncovered the strain's use of shiga toxin and its propensity to adhere tightly to cells in the digestive tract. This tight bond between the bacteria and the intestinal cells " might facilitate systemic absorption of shiga toxin," the authors wrote, upping the odds that a patient might progress to the sometimes deadly hemolytic uremic syndrome.

The strain was also resistant to common antibiotics, specifically penicillins and cephalosporins. Luckily, it was susceptible to another class of antibiotics called carbapenems.

According to the New England Journal of Medicine study, severe cases involving the hemolytic uremic syndrome have occurred mainly among adults, predominantly women. In one medical center in Hamburg, 12 of 59 patients infected with the O104:H4 strain went on to develop the sometimes form of deadly kidney failure, according to a team led by Christina Frank, of Berlin's Robert Koch Institute.

For their part, the authors of the Lancet study believe that the emergence of the new strain "tragically shows " how E. coli can change and "have serious consequences for infected people."

One outside expert agreed. Infectious disease expert Dr. Marc Siegel, an associate professor of medicine at New York University in New York City, said that "in this case the bug itself is more virulent and more transmissible."

This is just part of how the bacterium develops to survive, Siegel explained. And these changes may well affect other strains of E. coli. "These bugs are becoming more virulent," he said.

One culprit, according to Siegel, is the overuse of antibiotics in livestock. Dosing animals with large quantities of antibiotics can make bacteria such as E. coli resistant to the drugs, he said.

These bacteria can then find their way into produce via water contaminated with animal waste, Seigel added. From there, the pathogen need only find its way into a salad or other food to infect people.

More information

For more information on food borne illness, visit the U.S. Centers for Disease Control and Prevention.

SOURCES: Hugh Pennington, emeritus professor, bacteriology, University of Aberdeen, Scotland; Marc Siegel, M.D., associate professor, medicine, New York University, New York City, author of The Inner Pulse: Unlocking the Secret Code For Sickness and Health; June 23, 2011, The Lancet Infectious Diseases, online; June 23, 2011, online, New England Journal of Medicine

Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. The German National Academy of Sciences Leopoldina sets up new standing committees
2. Bowel cancer: 8 years of colonoscopy screening in Germany -- a success story
3. Frontiers in Cardiovascular Biology: July 16-19, 2010, Berlin, Germany
4. Public health systems compared: Germans more dissatisfied than the rest
5. National license for Springer eBooks signed in Germany
6. New MRSA Strain Found in Cows Milk in U.K., Denmark
7. Deadly E. Coli Strain in Europe Should Serve as Warning, Experts Say
8. Study finds livestock-related Staph strain in child care worker
9. Many HIV Patients Carry Strain With Drug-Resistant Mutation
10. Widespread school closures needed to stop strain on hospitals during epidemics
11. Pandemic flu strain could point way to universal vaccine
Post Your Comments:
Related Image:
German E. Coli Strain Especially Lethal, Studies Find
(Date:11/28/2015)... (PRWEB) , ... November 28, 2015 , ... ... exchange technology and teleradiology services, has added Chris Hafey and Claude Hooton to ... at the Radiological Society of North America (RSNA) 2015 Annual Meeting and continues ...
(Date:11/28/2015)... CA (PRWEB) , ... November 28, 2015 , ... Pixel ... fully customizable media panels to choose from, the possibilities are endless. Users have full ... more. With the ProPanel: Pulse masking effects, users are sure to get heads to ...
(Date:11/27/2015)... ... November 27, 2015 , ... According to an article ... the way that they are handling security in light of the recent terrorist attacks ... in an attempt to stop an attack from reaching U.S. soil. Especially around special ...
(Date:11/27/2015)... PA (PRWEB) , ... November 27, 2015 , ... ... how filthy the toilets were," said an inventor from Hillside, N.J. "Many people ... improved seat cover so that individuals will always be protected from germs." , ...
(Date:11/27/2015)... LOS ANGELES, CA (PRWEB) , ... November 27, 2015 , ... MPWH, the No.1 Herpes-only ... age of 30 (see Table 1-1 ). More than 3.7 billion people under ... simplex virus type 1 (HSV-1), according to WHO's first global estimates of HSV-1 infection ...
Breaking Medicine News(10 mins):
(Date:11/27/2015)... 27, 2015 Research and Markets ( ... Intrauterine Devices Market 2015-2019" report to their offering. ... In this report, the author the present scenario and ... 2015-2019. To calculate the market size, the report considers ... products: Hormonal IUDs and copper IUDs. The report forecasts ...
(Date:11/26/2015)... India , November 27, ... --> --> ... personal emergency response system (PERS) ... steadily for 5 years with ... region expected to see a ...
(Date:11/26/2015)... North Carolina , 26 november 2015 ... Inc. (AAIPharma/CML) kondigt de geplande investering aan ... uitbreiding van de laboratoria en het mondiale ... . De uitbreiding zal resulteren in extra ... wordt voldaan aan de groeiende behoeften van ...
Breaking Medicine Technology: