Featured Research

from universities, journals, and other organizations

Troubling Trends Converge: Drug-resistant Bacteria Gaining Genes For Virulence

Date:
September 26, 2005
Source:
University of Chicago Medical Center
Summary:
Researchers at the University of Chicago describe three cases of rapidly progressive and ultimately fatal Staphylococcus aureus infections in small children. The infection caused severe sepsis, rapid clinical deterioration and bleeding into the adrenal glands, a complication usually associated with fulminant bacterial meningitis. The disease progressed so rapidly that antibiotics had no effect. Such cases highlight a disturbing convergence of drug-resistant and virulent strains of Staph.

This is a scanning electron micrograph depicting Gram-positive Staphylococcus aureus bacteria.
Credit: CDC/PHIL

In a "Brief Report" in the 22 September 2005 issue of the New EnglandJournal of Medicine, researchers at the University of Chicago describethree cases of rapidly progressive and ultimately fatal Staphylococcusaureus infections in small children.

Related Articles


Although all three children were previously healthy, the infectioncaused severe sepsis, rapid clinical deterioration and bleeding intothe adrenal glands, a complication, known as Waterhouse-Friderichsensyndrome, that is usually associated with fulminant bacterialmeningitis.

Two of the three bacterial strains were resistant to standardantibiotics. In all three cases, the disease progressed so rapidly thatneither standard nor alternative antibiotics had an effect.

"What we saw in these patients is not in the textbooks," saidRobert Daum, M.D., professor of pediatrics at the University of Chicagoand senior author of the study. "This is the first time this unusualsyndrome has been described in patients with a Staph infection."

Such cases, although rare, highlight a disturbing convergence.In the last decade, drug-resistant strains of Staph. aureus have becomequite common. At the same time, reports of virulent newer strains ofStaph that can cause invasive disease, extensive tissue damage anddeath have increased.

"These bacteria have picked up genes that enable them to evademost of the drugs we used to employ to treat them," Daum said, "and nowthey are combining that with genes for various toxins that can causesevere illness."

Until the late 1990s, drug-resistant Staph infections wereviewed as a purely hospital-acquired illness. In the 25 February 1998issue of JAMA, however, a team led by Daum published the first studyshowing that Staphylococcus aureus infections that were alreadyresistant to many types of antibiotics were being seen in childrenoutside of the hospital environment.

Many physicians initially had doubts, but since then cases ofcommunity-acquired methicillin-resistant Staphyllococcus aureusinfections (now known as CA-MRSA) have been detected in most major U.S.cities and several rural settings , and subsequently in Europe, Asiaand South America.

This bacterium, often referred to simply as "Staph," is common,found on the skin and in the noses of an estimated 30 percent ofpeople. Staph is one of the most common causes of skin infections, suchas pimples or boils, which can usually be treated without antibiotics.It can also cause serious wound infections, bloodstream infections orpneumonia.

Recently, however, physicians around the country have beendescribing increasingly virulent Staph infections that caused by thecommunity-associated strains of MRSA. Last April, for example, authorsfrom California described cases of necrotizing fasciitis (like"flesh-eating disease") and necrotizing pneumonia (an aggressivetissue-destroying lung infection) caused by community-acquired MRSA.

These lethal manifestations are the "tip of the iceberg," Daum said, "but this is getting to be a substantial iceberg."

The overall rate of Staph infections has been increasing forseveral years. The difficult-to-treat, drug-resistant strains arebecoming more and more common outside of the hospital setting. Thesecommunity-acquired resistant strains appear to spread more easily thanthe better-known hospital-based microbes. Rare but devastatingtoxicities, such as the ones described in this paper, are beingrecognized. And as yet, scientists know relatively little about thecommunity-acquired variations of MRSA.

"This is something that demands our attention," Daum said. "Weneed to learn a lot more about this microbe and the genes it hascollected that have enabled it to move so quickly. We need to findbetter ways to treat this. And we need to work toward finding a vaccinethat can prevent Staph infections. That is the only way we have evertruly beaten an infectious disease."

###

The National Institute ofAllergy and Infectious Diseases, the Centers for Disease Control andPrevention, and the Grant HealthCare Foundation supported thisresearch. Coauthors of the paper include Patricia V. Adem, M.D.,Christopher P. Montgomery, M.D., Aliya N. Husain, M.D., Tracy K.Koogler, M.D., and Susan Boyle-Vavra, Ph.D, of the University ofChicago and Valerie Arangelovich, M.D., Michel Humilier, M.D.,of theCook County Medical Examiner's Office.


Story Source:

The above story is based on materials provided by University of Chicago Medical Center. Note: Materials may be edited for content and length.


Cite This Page:

University of Chicago Medical Center. "Troubling Trends Converge: Drug-resistant Bacteria Gaining Genes For Virulence." ScienceDaily. ScienceDaily, 26 September 2005. <www.sciencedaily.com/releases/2005/09/050926083151.htm>.
University of Chicago Medical Center. (2005, September 26). Troubling Trends Converge: Drug-resistant Bacteria Gaining Genes For Virulence. ScienceDaily. Retrieved March 29, 2015 from www.sciencedaily.com/releases/2005/09/050926083151.htm
University of Chicago Medical Center. "Troubling Trends Converge: Drug-resistant Bacteria Gaining Genes For Virulence." ScienceDaily. www.sciencedaily.com/releases/2005/09/050926083151.htm (accessed March 29, 2015).

Share This


More From ScienceDaily



More Health & Medicine News

Sunday, March 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

S. Leone in New Anti-Ebola Lockdown

S. Leone in New Anti-Ebola Lockdown

AFP (Mar. 28, 2015) — Sierra Leone imposed a three-day nationwide lockdown Friday for the second time in six months in a bid to prevent a resurgence of the deadly Ebola virus. Duration: 01:17 Video provided by AFP
Powered by NewsLook.com
These Popular Antibiotics Can Cause Permanent Nerve Damage

These Popular Antibiotics Can Cause Permanent Nerve Damage

Newsy (Mar. 27, 2015) — A popular class of antibiotic can leave patients in severe pain and even result in permanent nerve damage. Video provided by Newsy
Powered by NewsLook.com
WH Plan to Fight Antibiotic-Resistant Germs

WH Plan to Fight Antibiotic-Resistant Germs

AP (Mar. 27, 2015) — The White House on Friday announced a five-year plan to fight the threat posed by antibiotic-resistant bacteria amid fears that once-treatable germs could become deadly. (March 27) Video provided by AP
Powered by NewsLook.com
House Ready to Pass Medicare Doc Bill

House Ready to Pass Medicare Doc Bill

AP (Mar. 26, 2015) — In rare bipartisan harmony, congressional leaders pushed a $214 billion bill permanently blocking physician Medicare cuts toward House passage Thursday, moving lawmakers closer to resolving a problem that has plagued them for years. (March 26) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins