MRSA infections/pet connection

[Guest guest]

Tie to Pets Has Germ Jumping to and Fro

 

 

 

 

Alex di Suvero for The New York Times

INFECTION Don Graff of Belle Mead, N.J., with his English setter,

Sunny. The dog contracted MRSA after a spider bite but was given

medication and has improved.

By BRENDA GOODMAN

Published: September 21, 2009

For decades, the drug-resistant germ called

 

MRSA was almost exclusively a concern of humans, usually in

 

hospitals and other health care settings.

 

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Web Link

 

 

 

A critical evaluation of methicillin-resistant Staphylococcus aureus and

other bacteria of medical interest on commonly touched household surfaces

in relation to household demographics (American Journal of Infection

Control)

 

 

 

http://www.nytimes.com/2009/09/22/health/22mrsa.html

 

Health Guide:

 

MRSA InfectionBut in recent

years, the germ has become a growing problem for veterinarians, with an

increasing number of infections turning up in birds, cats, dogs, horses,

pigs, rabbits and rodents. And that, infectious-disease experts say, is

becoming a hazard to humans who own or spend time with these

animals.

 

“What’s happened for the first time that we’ve noticed is that you’re

getting flip back and forth,” said Scott Shaw, head of the infection

control committee at the Cummings School of Veterinary Medicine at

 

Tufts University.

It is unknown how often pets play a role in human infections by

methicillin-resistant Staphylococcus aureus and vice versa; physicians

and veterinarians do not routinely trace such infections to their source.

When such scientific sleuthing is conducted, however ­ usually in the

case of multiple or recurring infections ­ the results suggest a strong

link.

In 2008, for example, an elephant calf and 20 of its caretakers at the

San Diego Zoo contracted MRSA skin infections. An investigation by the

zoo and state health officials determined that the calf, which was

eventually euthanized, had probably been infected by a keeper who

unknowingly carried the bacteria. (The case was reported in

The

Morbidity and Mortality Weekly Report.)

Still, experts are not recommending routine testing of pets and their

humans. Instead, they call for the same kinds of precautions that apply

to other pathogens, especially frequent washing or sanitizing of hands

before and after playing with a pet.

The first cases of MRSA in pets, about five years ago, appeared to be in

therapy dogs and other animals exposed to patients or health care

workers. Those animals are still thought to be at greatest risk, but the

pattern might be changing.

In

 

a study this summer in The American Journal of Infection Control,

Elizabeth A. Scott and her colleagues at the Center for Hygiene and

Health in Home and Community at Simmons College in Boston swabbed

household surfaces like kitchen and bathtub drains, faucet handles,

toilets, high chairs, trash cans and kitchen sponges at 35 randomly

selected addresses to see what germs they would find. They found MRSA in

nearly half of the homes they sampled.

When they tried to figure out what might make it more likely to have the

bacteria at home, they ruled out many supposed risk factors, including

working out at a gym, having children who attended day care, having a

recent infection or recent

 

antibiotic use, and even working in a health care facility.

The one variable that overwhelmingly predicted the presence of the germ

was the presence of a cat. Cat owners were eight times more likely than

others to have MRSA at home.

“There are a number of papers coming out now showing that pets pick up

MRSA from us,” Dr. Scott said, “and that they shed it back into the

environment again.”

Dr. Scott’s next study will screen patients scheduled for elective

surgeries. When she finds MRSA, she will also test their pets to

determine how common that transmission might be.

“This is a burgeoning epidemic,” said Dr. Richard L. Oehler, an

infectious disease specialist at the University of South Florida College

of Medicine in Tampa, who reviewed case reports of MRSA’s jumping between

people and animals.

Dr.

Oehler’s paper appeared in July in The Lancet.

Dr. Oehler recounted the case of a diabetic man with recurrent MRSA skin

infections that were eventually traced to his dog, a Dalmatian who

carried the bacteria but was not ill.

“He would sleep with the couple in the bed and lick them in the face,”

said Dr. Farrin A. Manian, chief of

 

infectious diseases at St. John’s Mercy Medical Center in St. Louis.

 

Dr. Manian believes the dog was infected by its owner, but then served as

a reservoir for the bacteria, reinfecting his patient.

“Only after we treated all three members of the family were we able to

get rid of the infections,” Dr. Manian said.

Then there was the case of the 15-year-old girl and her calico cat; both

developed MRSA infections. DNA fingerprinting confirmed that the bacteria

in wounds on the girl’s arm and near the cat’s tail were the

same.

J. Scott Weese, a veterinary internist and microbiologist at the

University of Guelph in Ontario, believes MRSA infections transmitted

between people and animals are relatively rare.

His tests of randomly selected dogs, for example, have shown that at any

given time only 2 to 3 percent carry MRSA on their fur or skin or in

their saliva. And even if a pet becomes colonized, meaning that the

bacteria take up residence and reproduce, veterinarians say most healthy

animals should be rid of it in a matter of weeks.

For protection, Dr. Oehler recommends hand washing or using hand gels

before and after playing with a pet, not letting a pet lick people around

the face, and not washing pet food or water bowls in the same sink that

food is prepared.

People should also wear gloves when attending to pets that have open

wounds, he said, and should keep any of their own broken skin bandaged.

 

And Dr. Oehler advised owners to be more attentive to their pets’ health

in general.

“In many of these cases, there was a lack of awareness that the animal

was ill,” he said. “If a pet has a wound, they need that

evaluated.”

Dr. Weese, who estimated that relatively few animals were infected,

nevertheless agreed that attentiveness was in order. “In the grand scheme

of things with MRSA, pets are a pretty minor thing,” he said. “But when

you consider how many MRSA infections are occurring in North America at

the moment, if they’re a minor component of a major disease, that’s still

something we need to be aware of.”

And pets may pose a particular hazard because their relationships with

people can be very close.

“If you think about the individuals with whom you have the closest

contact in terms of duration, intensity, intimacy, in most people, it’s

going to be the spouse, then small children, then pets,” Dr. Weese said.

“For some people, pets are No. 1 on the list.”