Featured Research

from universities, journals, and other organizations

Increasing occurrence of MRSA bacteria in Denmark

Date:
October 4, 2012
Source:
Technical University of Denmark (DTU)
Summary:
In 2011, more Danes became infected with MRSA bacteria, and the number was the highest in over 25 years. The increase was primarily seen in otherwise healthy people without any hospital relation. Although the number of MRSA positive pig herds is on a par with the level seen in 2010, significantly more pigs at slaughter were found to be infected with the so-called pig MRSA, and the number of people infected with pig MRSA is increasing.

In 2011, more Danes became infected with MRSA bacteria, and the number was the highest in over 25 years. The increase was primarily seen in otherwise healthy people without any hospital relation. Although the number of MRSA positive pig herds is on a par with the level seen in 2010, significantly more pigs at slaughter were found to be infected with the so-called pig MRSA, and the number of people infected with pig MRSA is increasing.

Related Articles


This appears from the Danish surveillance report, DANMAP, for 2011.

MRSA bacteria are resistant to antimicrobial agents that are essential to treating life-threatening infections in humans. The number of people diagnosed with MRSA continues to rise, but compared with other countries, Denmark still experiences a low occurrence of infections caused by MRSA bacteria.

MRSA guideline works in hospitals

The number of new MRSA cases continued to increase to 1,292 in 2011, which was an 18% increase compared to 2010. The number is the highest seen in more than 25 years. The development from 2009 to 2010, when the number increased by 34%, thus continued in 2011.

The increase is seen primarily in community acquired cases (751 in 2011 compared with 578 in 2010). In about 12% of the cases, people had had contact with pigs, but in many of the cases there are no known risk factors. The number of cases acquired while abroad has also increased. However, the number of hospital-acquired cases remained low (61 cases in 2011 and 62 in 2010).

"It is an evident success that the number of hospital-acquired cases is still very low, but the continued rise in community acquired cases require, that we continue to do an effort at full strength," says Robert Skov, Consultant at Statens Serum Institut.

Increase in occurrence of pig MRSA In 2011, the occurrence of MRSA was studied in approx. 80 pig farms and about 800 pigs and 180 cattle in slaughterhouses. MRSA was not found in cattle, but in 16% of pig herds, which was the same level as in 2010.

44% of the pigs tested positive for MRSA at slaughter, which was higher than in 2009, when the last survey of pigs in slaughterhouses was conducted. This suggests that there was a higher occurrence in the positive herds than previously which means that MRSA more frequently was transmitted between pigs during transport and before slaughter.

The number of people infected with MRSA of the so-called pig type, CC398, increased from 109 in 2010 to 164 in 2011. MRSA CC398 constituted 12.5% of all MRSA cases in 2011. The vast majority of new cases were still seen in persons in direct contact with pigs.

"We need to prevent increasing occurrence of MRSA in pigs because we have a large pig production in Denmark and pigs are the main source of MRSA CC398," says Yvonne Agersψ, Senior Researcher at the National Food Institute, Technical University of Denmark.

Revision of MRSA guideline As a consequence of the increasing occurrence of MRSA CC398 contact with live pigs is now included as a risk factor in the revised MRSA guideline for healthcare professionals which will be published this autumn.

"The continued increase of community acquired MRSA and the increasing occurrence in agriculture should be taken seriously and combated as it could otherwise lead to increased hospital incidence. The fact that contact with live pigs is added as a risk factor in the revised MRSA guideline and is an important step in the right direction," says Robert Skov.

Facts

MRSA bacteria MRSA is short for Methicillin-resistant Staphylococcus aureus.

Staphylococci are bacteria found in humans, animals and in our surrounding environment. Staphylococcus aureus is part of the normal nasal and skin flora in approx. 50% of the population. Staphylococcus aureus can cause a wide range of infections ranging from superficial wounds and abscesses to serious infections such as Osteitis and Endocarditis. In hospitals, Staphylococcus aureus is the most frequent cause of post-surgery infections. A large proportion of those infected with MRSA are just carriers of MRSA without being sick.

When bacteria are exposed to antimicrobial agents, they protect themselves by developing resistance in order to survive. The resistant bacteria have changed their hereditary material -- their genes. The gene which primarily causes the resistance is called mecA. This makes the bacteria resistant to all so-called beta-lactam antimicrobial agents, including penicillin and the broad-spectrum antimicrobial agents cephalosporines. It is therefore important to only use antimicrobial agents as required to prevent overuse.

Researches are finding the same types of MRSA genes in both humans and a number of animals, including pigs and cows. In 2011, 16% of all pig herds were found positive with the so-called pig MRSA, which can be transmitted from pigs to humans.

Studies of approx. 800 meat samples from imported chicken, beef and pork and Danish chicken, beef and pork show the highest incidence of MRSA in imported chicken meat (31%) followed by Danish pork (10%), imported pork (5 %) and imported beef (4%). For the first time, MRSA was found in Danish chicken. For now, consumption of meat is not considered a source of human infections.

The occurrence of MRSA in humans in Denmark is still low compared to many other countries in Europe.

Animal and meat production in Denmark By far the most meat produced in Denmark comes from pigs. In 2011, 29,399,000 pigs were produced (equivalent to 2008 billion kg pork), 115,454,000 broilers (equivalent to 201 million kg chicken), and 551,000 cattle were slaughtered (equivalent to 145 million kg beef).


Story Source:

The above story is based on materials provided by Technical University of Denmark (DTU). Note: Materials may be edited for content and length.


Cite This Page:

Technical University of Denmark (DTU). "Increasing occurrence of MRSA bacteria in Denmark." ScienceDaily. ScienceDaily, 4 October 2012. <www.sciencedaily.com/releases/2012/10/121004104048.htm>.
Technical University of Denmark (DTU). (2012, October 4). Increasing occurrence of MRSA bacteria in Denmark. ScienceDaily. Retrieved November 24, 2014 from www.sciencedaily.com/releases/2012/10/121004104048.htm
Technical University of Denmark (DTU). "Increasing occurrence of MRSA bacteria in Denmark." ScienceDaily. www.sciencedaily.com/releases/2012/10/121004104048.htm (accessed November 24, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Monday, November 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Winter Can Cause Depression — Here's How To Combat It

Winter Can Cause Depression — Here's How To Combat It

Newsy (Nov. 23, 2014) — Millions of American suffer from seasonal depression every year. It can lead to adverse health effects, but there are ways to ease symptoms. Video provided by Newsy
Powered by NewsLook.com
Ebola-Hit Sierra Leone's Late Cocoa Leaves Bitter Taste

Ebola-Hit Sierra Leone's Late Cocoa Leaves Bitter Taste

AFP (Nov. 23, 2014) — The arable district of Kenema in Sierra Leone -- at the centre of the Ebola outbreak in May -- has been under quarantine for three months as the cocoa harvest comes in. Duration: 01:32 Video provided by AFP
Powered by NewsLook.com
Don't Fall For Flu Shot Myths

Don't Fall For Flu Shot Myths

Newsy (Nov. 23, 2014) — Misconceptions abound when it comes to your annual flu shot. Medical experts say most people older than 6 months should get the shot. Video provided by Newsy
Powered by NewsLook.com
WFP: Ebola Risks Heightened Among Women Throughout Africa

WFP: Ebola Risks Heightened Among Women Throughout Africa

AFP (Nov. 21, 2014) — Having children has always been a frightening prospect in Sierra Leone, the world's most dangerous place to give birth, but Ebola has presented an alarming new threat for expectant mothers. Duration: 00:37 Video provided by AFP
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