Wednesday, August 29, 2012

Staph Super Bugs?

Hate insects? Afraid of germs? Researchers are reporting an alarming combination: bed bugs carrying a staph "superbug." Canadian scientists detected drug-resistant staph bacteria in bed bugs from three hospital patients from a downtrodden Vancouver neighborhood.

Bedbugs have not been known to spread disease, and there's no clear evidence that the five bedbugs found on the patients or their belongings had spread the MRSA germ they were carrying or a second less dangerous drug-resistant bacteria.

However, bed bugs can cause itching that can lead to excessive scratching. That can cause breaks in the skin that make people more susceptible to these germs, noted Dr. Marc Romney, one of the study's authors.

The study is small and very preliminary. "But it's an intriguing finding" that needs to be further researched, said Romney, medical microbiologist at St. Paul's Hospital in Vancouver.

The hospital is the closest one to the poor Downtown Eastside neighborhood near the city's waterfront. Romney said he and his colleagues did the research after seeing a simultaneous boom in bed bugs and MRSA cases from the neighborhood.

Five bed bugs were crushed and analyzed. MRSA, or methicillin-resistant Staphylococcus aureus, was found on three bugs. MRSA is resistant to several types of common antibiotics and can become deadly if it gets through the skin and into the bloodstream.

Two bugs had VRE, or vancomycin-resistant Enterococcus faecium, a less dangerous form of antibiotic-resistant bacteria.

Both germs are often seen in hospitals, and experts have been far more worried about nurses and other health care workers spreading the bacteria than insects.

It's not clear if the bacteria originated with the bed bugs or if the bugs picked it up from already infected people, Romney added.

Bed Bugs - Recent Study on Disease Transmission

There has been a major increase in bed bug incidence in North America and Europe in recent years and aside from being an extreme nuisance and the destroyer of property and sanity of many lives, now bed bugs carrying two types of drug-resistant bacteria have been found by Canadian researchers.

The bed bugs were found to be carrying methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus faecium (VRE).

Further studies are needed to characterize the association between S. aureus and bed bugs. Bed bug carriage of MRSA, and the portal of entry provided through feeding, suggests a plausible potential mechanism for passive transmission of bacteria during a blood meal.  Because of the insect's ability to compromise the skin integrity of its host, and the propensity for S. aureus to invade damaged skin, bed bugs may serve to amplify MRSA infections in impoverished urban communities.

The phenotype of the MRSA found in the bed bugs is identical to that found in tests of many Eastside patients with MRSA infections according to the report.

These findings suggest that bed bugs may act as a "hidden environmental reservoir" that promotes the spread of MRSA in overcrowded and impoverished communities.