Context:
• A nationwide study (2022–2024) across Delhi, Mumbai, Kolkata, and Chennai has revealed alarming trends in antimicrobial resistance (AMR) through analysis of urban wastewater.
Key Highlights:
- Scientific Study & Methodology
• Conducted by CSIR–Centre for Cellular and Molecular Biology (CCMB) and partner institutions
• 447 samples from 19 sites analyzed
• Used shotgun metagenomics to study microbial genetic material - Findings on Resistance Patterns
• Different cities host different bacteria, but similar survival strategies are observed
• Common mechanisms:
• Strengthening cell walls
• Efflux pumps to expel antibiotics
• Enzymatic destruction of antibiotics
• Resistance genes are easily transferable between microbes - City-Specific Observations
• Klebsiella pneumoniae → dominant in Chennai & Mumbai
• Pseudomonas aeruginosa → prevalent in Kolkata
• Resistance against tetracyclines, beta-lactams, macrolides widespread - Governance & Surveillance Insights
• Demonstrates potential of wastewater-based epidemiology for:
• Early detection of outbreaks
• Monitoring drug-resistant pathogens
• Developed Standard Operating Procedure (SOP):
• Sample storage at 4°C for up to 7 days
Relevant Prelims Points:
• Antimicrobial Resistance (AMR):
• Microorganisms evolve to withstand antimicrobial drugs
• Considered a global health threat (WHO priority)
• Shotgun Metagenomics:
• Studies DNA directly from environmental samples
• Helps identify microbial diversity and resistance genes
• Antibiotic Classes:
• Beta-lactams (e.g., penicillin)
• Tetracyclines (broad-spectrum antibiotics)
• Macrolides (e.g., erythromycin)
• Wastewater Surveillance:
• Used globally (e.g., COVID-19 tracking)
Relevant Mains Points:
• AMR as a silent pandemic impacting healthcare systems
• Need for integrated surveillance systems (One Health approach)
• Role of urban sanitation and wastewater management
• Importance of data-driven policymaking in public health
• Challenges:
• Lack of infrastructure in developing countries
• Overuse/misuse of antibiotics
- Way Forward
• Strengthen national AMR surveillance networks
• Scale up wastewater monitoring systems
• Promote rational antibiotic use policies
• Invest in research on alternative therapies
• Enhance public awareness and sanitation systems
UPSC Relevance:
• GS 3 – Science & Technology, Environment
• GS 2 – Governance (Public Health)
• Prelims – AMR, metagenomics