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Flies and cockroaches carry antibiotic-resistant bacteria from

factory farms, study finds



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Veganwolf.com
Grist Magazine February 25, 2011

 

http://www.grist.org/article/2011-02-25-flies-cockroaches-antibiotic-resistant-bacteria-factory-farms

 

Flies and cockroaches carry antibiotic-resistant bacteria from

factory farms, study finds

 

by Tom Philpott

 

What sort of antibiotic-resistant pathogens are growing on factory

farms, along with all the cheap pork chops and chicken wings? And

what level of threat do they pose to our health?

 

Well, we know that in total, factory-farm animals consume a

jaw-dropping four times as many antibiotics as do people in the

United States, thanks to diligent reporting by Maryn McKenna and

Ralph Loglisci and work by Rep. Louise Slaughter (D-N.Y.).

 

And we know that a kind of antibiotic-resistant staph infection

called MRSA now kills more people than AIDS -- and infects people who

never set foot in a hospital, which is the site where MRSA is thought

to have originated. We also know, due to the stellar work of Iowa

State University researcher Tara Smith, that pigs in confined animal

feedlot operations, and the workers who tend them, routinely carry

MRSA strains (her paper can be found here).

 

We also know that, by the FDA's own reckoning, meat on grocery store

shelves is routinely infected by pathogens resistant to multiple

antibiotics (again, McKenna's work brought the FDA's perhaps

intentionally obscure report to light).

 

And now we know of yet another means by which antibiotic-resistant

nasties can make their way from meat factories into the broader

community: through the cockroaches and flies drawn to the titanic

amounts of manure produced on factory farms. For a paper published

last month in the journal Microbiology, researchers from North

Carolina State and Kansas State universities took one for the team --

i.e., the public. They did something few of us would want to do:

rounded up common flies and roaches hanging around factory hog farms,

and tested them to see what kinds of bacteria they were harboring.

 

Their finding? More than 90 percent of the insects sampled carried

forms of the bacteria Enterococci that are resistant to at least one

common antibiotic, and often more than one. Here's how the authors

summed up their findings in the paper's abstract:

 

This study shows that house flies and German [common] cockroaches in

the confined swine production environment likely serve as vectors

and/or reservoirs of antibiotic resistant and potentially virulent

enterococci and consequently may play an important role in animal and

public health.

 

In a press release, study coauthor Coby Schal, entomology professor

at NC State, broke it down in simpler terms:

 

"The big concern is not that humans will acquire drug-resistant

bacteria from their properly cooked bacon or sausage, but rather that

the bacteria will be transferred to humans from the common pests that

live with pigs and then move in with us."

 

Meanwhile, evidence is mounting that factory-scale animal farms exact

a high toll from the people who live around them in other ways, too.

A study by University of North Carolina professor Steve Wing and

others shows that people with the bad luck to live near giant hog

farms suffer demonstrably worse health when the factories are getting

up to malodorous stuff like spraying untreated (and thus

antibiotic-resistant-bacteria-laden) manure on fields. Among the many

hidden costs of cheap pork is that people who live near factory farms

are doomed either to be sick or shut in at certain times of the year.

(McKenna has an excellent discussion of the Wing study on her Wired

blog: http://www.wired.com/wiredscience/2011/02/pig-farms-pollution/ )

 

To answer the questions I posed in the opening paragraph, it seems

we're brewing up some pretty nasty pathogens in our meat factories,

along with all the pork chops and chicken wings. And they're coming

our way, carried out on the meat itself, by factory-farm workers, and

by common creepy-crawly and flying insects.

 

Seems like there should be a law banning the non-therapeutic use of

antibiotics on farms. In 2009, Rep. Louise Slaughter introduced the

Preservation of Antibiotics for Medical Treatment Act (PAMTA). So

far, the meat industry has managed to, well, slaughter it. But she

plans to introduce PAMTA again this year

 

 







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