could your compost kill you

7/27/2019 Could Your Compost Kill You

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Scottish researchers warned that four showed evidence of Legionella

longbeachae, which can cause serious infections leading to admission to

hospital or death.

Dr Tara Beattie, from the University of Strathclyde, who led the research, said:'Disease causing micro-organisms are widespread in the environment, andtherefore it is not too surprising that species of Legionella that can cause human

disease are present in compost.

'Any environment where you have pathogenic bacteria could be a source of

infection, and we already know that compost has been linked to human

Legionella infection in countries such as Australia and New Zealand.

'Within the UK and across Europe, composts have traditionally been composed

of peat, whereas sawdust and bark are more often used to produce compost inAustralia and New Zealand where Legionellosis associated with compost is

more common.


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Dr Tara Beattie, from the University of Strathclyde, said: 'Disease causing micro-organisms are

widespread in the environment, and therefore it is not too surprising that species of Legionella

(pictured) that can cause human disease are present in compost'

WHAT IS LEGIONELLA LONGBEACHAE?

Legionella longbeachae can be found in potting mixes, compost heaps and

composted animal manures.

How Legionella longbeachae are spread is uncertain.

The bacteria may be breathed in or spread from hand to mouth.

Legionella longbeachae can remain on hands contaminated by handling potting

mix for periods of up to one hour and can be removed by washing.

It cannot be spread person-to-person

To minimise the risk of infection when handling potting mix, gardeners should:

Wear a face mask Open bags with care to avoid inhalation of airborne potting mix Moisten the contents to avoid creating dust Always wear gloves to avoid transferring the potting mix from hand to

mouth

Always wash hands after handling potting mix - even if gloves had beenworn

'It may be that the change in composition of composts in the UK, moving awayfrom peat based products, could be resulting in species such as Legionella

longbeachae being present in compost and therefore more cases of infection

could occur.'

The findings are reported in the journal Clinical Microbiology and Infection.

Last month health experts recommended putting warning labels on compost

bags after a spate of Legonella longbeachae infections in Scotland.

Five people have been affected since the outbreak began in August.

The latest victim was being treated in hospital in Dundee two weeks ago.


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Dr Beattie said: 'A larger scale survey, covering a wider range of compost

products is required to determine if these organisms - some disease causing,

some not - are as widespread in composts as this initial study would suggest.

'It should be emphasised though, that although Legionella seem to be commonin compost, human infection is very rare, especially if you consider the volumeof compost sold and used.

'But with any potential source of infection precautions should always be taken.

'The occurrence of these bacteria in composts in Australia and New Zealand and

the cases of infection that have been traced to compost, has resulted in hygiene

warnings on compost packaging in these countries, and this is somethingmanufacturers in the UK may wish to consider.'


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Tests on 22 brands of compost available in the UK found that 14 contained a variety of

Legionella bugs. European composts have traditionally been composed of peat, whereas sawdust

and bark are often used to produce compost in Australia where Legionellosis is more common

could your compost kill you

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