Babies given antibiotics before they are a year old are more
likely to develop eczema, say British researchers.
After years of debate about a possible link, a huge study
shows taking the drugs in the first year of life increases the chances of
developing the skin disorder by 40 per cent.
Each additional course of antibiotics further raises the
risk of eczema – which affects one in five children in the UK – by 7 per cent.
About 2.4million of the UK’s 12million children have been
diagnosed with the disease, caused by an over-active immune system and
resulting in dry and itchy skin.
Researchers from Guy’s and St Thomas’ NHS Foundation Trust,
King’s College London, the University of Nottingham and the Aberdeen Royal
Infirmary reviewed data from 20 studies involving almost 293,000 babies and
children.
Senior researcher Dr Carsten Flohr, of King’s College
and Guy’s, said some previous studies had implied a link, but this was the
first systematic large-scale review.
He said: ‘We found antibiotic exposure in early life may
increase the risk of subsequent eczema by up to 40 per cent, with
broad-spectrum antibiotics having a more pronounced effect. It’s a real effect.
‘Having antibiotics in the second year of life is less
likely to be important, but we don’t have the studies to examine it.’
Dr Flohr recommended that antibiotics should be prescribed
‘with caution’, especially to infants with a family history of eczema or
allergic disease.
But he stressed: ‘Doctors usually have good reason to
prescribe antibiotics to infants.
‘The importance of this finding is to get a better
understanding of the complex relationship between antibiotic use and allergic
disease.
‘We need further research as determination of a true link
between antibiotic use and eczema would have far-reaching clinical and public
health implications.’
The latest research analysed 16 studies looking at a
potential link between eczema and use of antibiotics in under ones and three
more examining a possible link with exposure in the womb. One study looked at
both, says a report in the British Journal of Dermatology.
Researchers found a ‘trend’ with prenatal exposure but
insufficient evidence to make a link.
Eczema has no cure, but medical moisturisers called
emollients can be used to keep the skin lubricated, backed up by steroid
creams.
The proportions of children with eczema has risen from 3 per
cent in the 1950s to 20 per cent today.
Rising allergy levels have several suspected triggers such
as too-clean lifestyles, Caesarean births – which may affect immune systems –
diet and the early use of antibiotics.
Nina Goad, of the British Association of Dermatologists,
said: ‘Eczema is our most common skin disease.
‘The evidence is not conclusive and the researchers are not
suggesting that parents should withhold antibiotics from children when doctors
feel such treatment is necessary.
‘But studies like this give an insight into possible
avoidable causes and may help to guide medical practice.’
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