Hospital superbugs may be thriving on disinfectants

Disinfectants designed to keep bacteria out of homes and hospitals could be fuelling the growth of superbugs, a study suggests.

Scientists found that exposing infectious bacteria to increasing amounts of disinfectant turned the bugs into hardy survivors.

Not only did they become immune to the cleansing chemicals, but they developed resistance to a commonly prescribed antibiotic, ciprofloxacin. This was despite the bugs not having previously encountered the drug.

The findings could have important implications for controlling the spread of hospital infections, the researchers believe.

Scientists led by Dr Gerard Fleming from the National University of Ireland in Galway, carried out the tests on Pseudomonas aeruginosa, a bacterium that causes a wide range of infections in people with weak immune systems.

Sufferers of diseases such as cystic fibrosis and diabetes are also vulnerable to the bug, which is responsible for many hospital-acquired indfections.

The scientists found that the bacteria adapted to disinfectant exposure by improving their ability to pump antimicrobial agents out of their cells.

They also developed a DNA mutation that helped them resist ciprofloxacin-type antibiotics.

Disinfectants are commonly used in homes, workplaces and hospitals to kill bacteria on surfaces, while antibiotics are administered to infected patients.

Bacteria that can resist both these control points could be a serious threat in hospitals, said the scientists.

The study, reported in the January issue of the journal Microbiology, showed that exposure to small non-lethal amounts of disinfectant encouraged the survival of resistant bacteria.

Dr Fleming said: “In principle this means that residue from incorrectly diluted disinfectants left on hospital surfaces could promote the growth of antibiotic-resistant bacteria. What is more worrying is that bacteria seem to be able to adapt to resist antibiotics without even being exposed to them.”

He stressed the importance of studying environmental factors that might promote antibiotic resistance.

“We need to investigate the effects of using more than one type of disinfectant on promoting antibiotic-resistant strains,” he said. “This will increase the effectiveness of both our first and second lines of defence against hospital-acquired infections.”

More in this Section

The invasion of London has begun as Irish fans pour in ahead of Grand Slam clash

Two men who punched female wheelchair user and knocked her to ground are jailed

Gardaí investigating movement of three cars in Wexford related to gun seizure

Man arrested for dangerous driving after Garda false mileage swoop

Today's Stories

Machete-hurley among weapons seized in raids in north Cork

Mother asks HSE to help son jailed for assaulting her

Don't rain on our St Patrick’s Day: A guide to start times and places for today's parades

Twins no longer identical after one brother's year on International Space Station


The biggest cancer killer will take your breath away

Hopefully she had an idea...

Power of the press: Meryl Streep and Tom Hanks discuss 'The Post'

More From The Irish Examiner