Rivers appear to be a significant source of antibiotic resistant bacteria, and have a consequential impact on the environment. New research into the river Thames has found numbers to be higher near waste water treatment works.
In
2013 Digital Journal
reported
that antibiotic-resistant bacteria had been isolated in specific spots along
the Hudson river, from the Tappan Zee Bridge to lower Manhattan. The cause was linked
to raw sewage being pumped into the water. Now similar research has uncovered
the same trend in the U.K.
The
finding is the outcome of a joint project between microbiologists working at University
of Warwick's School of Life Sciences and the University of Exeter Medical
School.
The research
into the river Thames has discovered high numbers of antibiotic resistant
bacteria and has shown that the numbers of such bacteria are highest close to
water treatment facilities. Many of the bacteria recovered are from the class Enterobacteriaceae,
a grouping that includes many human gut pathogens like Escherichia coli.
For the study, the
microbiologists analysed water and sediment samples from 13 sites across the
Thames river catchment and developed detailed models to predict the
distribution of antibiotic resistant bacteria.
This
supports the theory that high numbers of antibiotic resistant bacteria are
released into the environment through human and agricultural use. With agriculture, the situation
arises because of the administration of antibiotics to farm animals. This is
done to increase the quality of meat. However, it is hard to avoid animal
slurry from entering rivers, especially during times of heavy rain.
The
results are important due to the concerns with the rise in antimicrobial
resistant bacteria
and the risks these organisms pose to human health (especially with those
receiving hospital treatment.)
In terms
of waste water treatment, it was found that not all water processing plants are
the same. Those that use a third phase of sludge treatment (tertiary plants)
tended to pump out lower numbers of bacteria (and hence lower numbers of
antibiotic resistant bacteria.)
Posted by Tim Sandle
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