Human skin is a zoo of bacteria, scientists say

The first detailed survey of the microbial "zoo" living on the human body has found far more species than expected, with a significant proportion being new to science.

A molecular technique has been developed by scientists that can identify each individual bacteria living on the surface of the skin.

They found that on average people have 182 species of bacteria living at any one time on their forearms, and about 8 per cent of these have never been formally described by scientists.

Martin Blaser, a microbiologist at New York University School of Medicine, said it was the first time the human skin had been analysed with such a powerful forensic technique.

"This is essentially the first molecular study of the skin, which is home to a virtual zoo of bacteria," Professor Blaser said. "There are probably fewer than 10 labs in the United States looking at this question. It is very intensive work."

The study, published in the journal Proceedings of the National Academy of Sciences, involved taking swabs from the lower forearms of six men and women. The lower forearm was chosen because it is an area of skin that is usually not washed very frequently and yet is easily accessible without having to remove clothing.

About half of the bacteria identified by the molecular analysis belonged to one of four established bacterial groups known to live on human skin - the propionibacteria, corynebacteria, staphylococcus and streptococcus. Almost three quarters of the total number of species were found to be unique to each individual, showing that the range of bacteria differs substantially between people.

The findings also suggested there may be differences between men and women in terms of the colonies of the bacteria.

The scientists also found the variety of bacteria on any one individual changed over the several months in which the swabs were taken. The predominant species did not change much but the transient bacteria did vary over time.

"What that suggests is that there is a scaffold of bacteria present in everybody's skin. Some stay and others come and go," Professor Blaser said.

The study was part of a larger effort to examine the entire range of human microbial ecology. It is estimated that the body's microbial cells outnumber human cells by 10 to one.

Professor Blaser said: "Many of the bacteria of the human body are still unknown. We all live with bacteria all our lives and occasionally we smile, so they're not that bad for us."

PROMOTED VIDEO
News
Jamie and Emily Pharro discovering their friend's prank
video
News
i100
News
Tim Vine has won the funniest joke award at the Edinburgh Festival 2014
peopleTim Vine, winner of the Funniest Joke of the Fringe award, has nigh-on 200 in his act. So how are they conceived?
News
people
Life and Style
techApp to start sending headlines, TV clips and ads to your phone
Arts and Entertainment
Taylor Swift crawls through the legs of twerking dancers in her 'Shake It Off' music video
musicEarl Sweatshirt thinks so
Life and Style
tech
News
ebooksAn evocation of the conflict through the eyes of those who lived through it
Arts and Entertainment
Daniel Radcliffe and Zoe Kazan in What If
filmReview: Actor swaps Harry Potter for Cary Grant in What If
News
Our resilience to stress is to a large extent determined by our genes
science
Travel
travel
Sport
sportBesiktas 0 Arsenal 0: Champions League qualifying first-leg match ends in stalemate in Istanbul
News
Pornography is more accessible - and harder to avoid - than ever
news... but they still admit watching it
Independent
Travel Shop
the manor
Up to 70% off luxury travel
on city breaks Find out more
santorini
Up to 70% off luxury travel
on chic beach resorts Find out more
sardina foodie
Up to 70% off luxury travel
on country retreats Find out more
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Project Manager (App development, SAP, interfacing)

£50000 - £60000 Per Annum + excellent company benefits: Clearwater People Solu...

Systems Developer Technical Lead

£65000 - £70000 Per Annum: Clearwater People Solutions Ltd: Our client based i...

Energy Engineer

£25000 - £30000 Per Annum: The Green Recruitment Company: Job Title: Energy En...

Techincal Accountant-Insurance-Bank-£550/day

£475 - £550 per day + competitive: Orgtel: Senior Technical Accountant-Insuran...

Day In a Page

Ferguson: In the heartlands of America, a descent into madness

A descent into madness in America's heartlands

David Usborne arrived in Ferguson, Missouri to be greeted by a scene more redolent of Gaza and Afghanistan
BBC’s filming of raid at Sir Cliff’s home ‘may be result of corruption’

BBC faces corruption allegation over its Sir Cliff police raid coverage

Reporter’s relationship with police under scrutiny as DG is summoned by MPs to explain extensive live broadcast of swoop on singer’s home
Lauded therapist Harley Mille still in limbo as battle to stay in Britain drags on

Lauded therapist still in limbo as battle to stay in Britain drags on

Australian Harley Miller is as frustrated by court delays as she is with the idiosyncrasies of immigration law
Lewis Fry Richardson's weather forecasts changed the world. But could his predictions of war do the same?

Lewis Fry Richardson's weather forecasts changed the world...

But could his predictions of war do the same?
Kate Bush asks fans not to take photos at her London gigs: 'I want to have contact with the audience, not iPhones'

'I want to have contact with the audience, not iPhones'

Kate Bush asks fans not to take photos at her London gigs
Under-35s have rated gardening in their top five favourite leisure activities, but why?

Young at hort

Under-35s have rated gardening in their top five favourite leisure activities. But why are so many people are swapping sweaty clubs for leafy shrubs?
Tim Vine, winner of the Funniest Joke of the Fringe award: 'making a quip as funny as possible is an art'

Beyond a joke

Tim Vine, winner of the Funniest Joke of the Fringe award, has nigh-on 200 in his act. So how are they conceived?
The late Peter O'Toole shines in 'Katherine of Alexandria' despite illness

The late Peter O'Toole shines in 'Katherine of Alexandria' despite illness

Sadly though, the Lawrence of Arabia star is not around to lend his own critique
Wicken Fen in Cambridgeshire: The joy of camping in a wetland nature reserve and sleeping under the stars

A wild night out

Wicken Fen in Cambridgeshire offers a rare chance to camp in a wetland nature reserve
Comic Sans for Cancer exhibition: It’s the font that’s openly ridiculed for its jaunty style, but figures of fun have their fans

Comic Sans for Cancer exhibition

It’s the font that’s openly ridiculed for its jaunty style, but figures of fun have their fans
Besiktas vs Arsenal: Five things we learnt from the Champions League first-leg tie

Besiktas vs Arsenal

Five things we learnt from the Champions League first-leg tie
Rory McIlroy a smash hit on the US talk show circuit

Rory McIlroy a smash hit on the US talk show circuit

As the Northern Irishman prepares for the Barclays, he finds time to appear on TV in the States, where he’s now such a global superstar that he needs no introduction
Boy racer Max Verstappen stays relaxed over step up to Formula One

Boy racer Max Verstappen stays relaxed over step up to F1

The 16-year-old will become the sport’s youngest-ever driver when he makes his debut for Toro Rosso next season
Fear brings the enemies of Isis together at last

Fear brings the enemies of Isis together at last

But belated attempts to unite will be to no avail if the Sunni caliphate remains strong in Syria, says Patrick Cockburn
Charlie Gilmour: 'I wondered if I would end up killing myself in jail'

Charlie Gilmour: 'I wondered if I'd end up killing myself in jail'

Following last week's report on prison suicides, the former inmate asks how much progress we have made in the 50 years since the abolition of capital punishment