WHAT WE FLUSH AWAY MAY NOT DISAPPEAR—IT MAY CARRY THE WARNING SIGNS OF THE NEXT PUBLIC-HEALTH CRISIS.
By Dr. Anu Kumar
Every day, millions of litres of wastewater leave our homes, hospitals, farms and industries. We flush toilets, wash our hands, clean our homes and send this water into drains, rarely thinking about what happens after it disappears from our sight. Yet beneath the surface of this apparently dirty and unwanted water lies a biological story that could have profound consequences for public health. Scientists are increasingly discovering that wastewater is not simply a waste product; it is a biological record of society, containing microorganisms, genetic material, chemical residues and, importantly, antimicrobial-resistant bacteria and the genes that enable them to survive antibiotics.
These resistant microorganisms are popularly known as “superbugs”. Antimicrobial resistance, or AMR, develops when bacteria and other microorganisms change in ways that allow them to survive medicines that were previously effective against them. The World Health Organization has identified antimicrobial resistance as one of the major global health threats of our time. The problem is particularly serious because modern medicine depends heavily on effective antibiotics. Routine surgeries, cancer treatments, organ transplantation, intensive-care medicine and the treatment of serious bacterial infections all rely on the ability to control microorganisms with antimicrobial drugs.
The danger, however, does not remain confined to hospitals. Antibiotics used in human healthcare, veterinary medicine and agriculture can eventually enter the environment. Resistant bacteria and resistance genes can also pass into wastewater through human and animal waste. Sewage brings together microorganisms originating from households, hospitals, healthcare facilities, farms and other sources. Within this complex microbial environment, bacteria can interact and, under suitable conditions, exchange genetic information. One important mechanism is horizontal gene transfer, through which genetic material carrying resistance traits can move between microorganisms.
In simple terms, bacteria can sometimes acquire genetic instructions that help them survive antibiotics. This makes wastewater an important part of the environmental dimension of antimicrobial resistance.
For India, this issue deserves particular attention. The country has a huge and diverse population, rapidly expanding urban areas, intensive healthcare systems, agricultural activity and a large pharmaceutical sector. Indian research has detected antibiotic residues and numerous antimicrobial-resistance genes in urban wastewater. Such findings do not mean that every sewage drain contains dangerous pathogens or that exposure automatically results in infection.
However, they demonstrate that wastewater can act as an environmental reservoir where resistant microorganisms and resistance genes may persist, interact and potentially spread. This is precisely why AMR can no longer be considered only a medical problem. It is an environmental, agricultural, veterinary and public-health problem at the same time.
Biotechnology can contribute to this challenge in several ways. Scientists are investigating advanced biological treatment processes, microbial systems, membrane technologies, biosorption and other methods to reduce pharmaceutical residues and microbial contaminants. At the same time, research into bacteriophages, antimicrobial peptides, precision diagnostics and CRISPR-based technologies is opening new possibilities for combating resistant pathogens. Artificial intelligence is also increasingly being used to analyze genomic information and identify patterns associated with antimicrobial resistance. These technologies offer hope, but they cannot substitute for responsible antibiotic use and effective public-health practices.
The battle against superbugs will not be won by discovering a single miracle antibiotic. It will require us to understand how resistance develops, how resistance genes travel and how those pathways can be interrupted. Perhaps one of the most important places to begin is somewhere most people never think about: the wastewater flowing beneath our cities.
What we flush away does not simply disappear. It may carry the microbial fingerprints of our society—and if we learn to read those fingerprints, wastewater could become more than a problem to manage. It could become one of our most valuable tools for predicting, monitoring and preventing the next public-health crisis.
The warning may already be flowing through our drains. The question is whether we are prepared to listen. (Writer is an Associate Professor Biotechnology Department Chandigarh University, Mohali, Punjab)
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