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Wastewater treatment plant discharges can promote the development of antibioticresistance in streams
april 6, 2016
Widespread use of antibiotics has led to pollution of waterways, potentially creating resistance among freshwater bacterial communities. A new study looked for antibiotic resistance genes in a river basin in Spain, revealing that wastewater discharges can promote the spread of antibiotic resistance in streams and small rivers.
Antibiotics are a cornerstone of modern medicine and have saved millions of lives. However, their extensive use has led to the development of widespread resistance, rendering them ineffective against some infections. Microorganisms resistant to commonly prescribed antibiotics are increasingly being found, leading the World Health Organization to declare antibiotic resistance a ‘major threat to public health’. Already, approximately 25 000 European citizens die every year from infections caused by bacteria resistant to antibiotics1 .
Although some bacteria are intrinsically resistant to antibiotics, and resistant strains evolve naturally, the overuse of antibiotics accelerates this process. Drug-resistant bacteria can pass on resistance to other bacteria, via a process called ‘horizontal gene transfer’, which is thought to be the major cause of the spread of resistance among bacteria.
While the clinical side of this problem has been studied extensively, there is a less-studied environmental aspect. Antibiotics are not fully metabolised by animals (including humans), which means that residues can enter the aquatic environment via wastewater discharges. Recent studies have shown that concentrations of antibiotics found in aquatic environments could aid selection of resistant bacteria. Inputs from urban wastewater treatment plants (WWTPs) can also include antibiotic-resistant bacteria and resistance genes.
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april 6, 2016
Widespread use of antibiotics has led to pollution of waterways, potentially creating resistance among freshwater bacterial communities. A new study looked for antibiotic resistance genes in a river basin in Spain, revealing that wastewater discharges can promote the spread of antibiotic resistance in streams and small rivers.
Antibiotics are a cornerstone of modern medicine and have saved millions of lives. However, their extensive use has led to the development of widespread resistance, rendering them ineffective against some infections. Microorganisms resistant to commonly prescribed antibiotics are increasingly being found, leading the World Health Organization to declare antibiotic resistance a ‘major threat to public health’. Already, approximately 25 000 European citizens die every year from infections caused by bacteria resistant to antibiotics1 .
Although some bacteria are intrinsically resistant to antibiotics, and resistant strains evolve naturally, the overuse of antibiotics accelerates this process. Drug-resistant bacteria can pass on resistance to other bacteria, via a process called ‘horizontal gene transfer’, which is thought to be the major cause of the spread of resistance among bacteria.
While the clinical side of this problem has been studied extensively, there is a less-studied environmental aspect. Antibiotics are not fully metabolised by animals (including humans), which means that residues can enter the aquatic environment via wastewater discharges. Recent studies have shown that concentrations of antibiotics found in aquatic environments could aid selection of resistant bacteria. Inputs from urban wastewater treatment plants (WWTPs) can also include antibiotic-resistant bacteria and resistance genes.
READ MORE