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How waste water treatment could make germs resistant to antibiotics
Scientists are concerned about
the increasing resistance to antibiotics in humans, which is being heightened
by waste water treatment facilities and other environmental factors.
A recent report published in the
November issue of the Lancet Infectious Diseases has expressed worry on this
issue.
Antibiotic resistance arises when
bacteria evolve mechanisms to withstand drugs which are used to fight them.
Recent years have seen an immense increase in the use of antibiotics, and this
in the absence of adequate regulatory controls, treatment guidelines and
patient awareness, has led to a global surge in antibiotic resistance.
"The environment is key in
the spread of resistance," said lead author of the report Dr. Ramanan
Laxminarayan, research scholar at Princeton Environmental Institute and Public
Health Foundation of India.
The global report, compiled by 26
leading experts in this field from around the world, includes Dr. Chand Wattal,
chairperson of the Department of Microbiology (Sir Ganga Ram Hospital) and Dr.
Ramanan Laxminarayan.
"Many drivers of antibiotic
consumption are grounded in human medicine. However, antibiotic use in
veterinary medicine and for growth promotion and disease prevention in
agriculture, aquaculture, and horticulture is also a major contributing
variable...
"For example, waste water
treatment facilities can be a hotspot. The chlorination of drinking water can,
in fact, concentrate some antibiotic resistant genes," Dr Wattal said.
One of the key recommendations is
for more research on how to neutralise man-made antibiotic pressure and to
control the resistance pool in hotspot environments. It also calls for a bolder
intervention outside hospitals.
According to experts, selection
pressure has made almost all disease-causing bacteria resistant to antibiotics
commonly used to treat them.
The reports says E. coli in the
urine cultures of pregnant women in India during their first trimester showed
the highest overall resistance to ampicillin, naladixic acid and co-trimoxazole
at 75 per cent , 73 per cent, and 59 per cent respectively, between 2004 and
2007.
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