India study maps antibiotic resistance in four cities, finds bacteria using similar survival strategies, Pg2

Key Highlights:

• A study mapping antimicrobial resistance (AMR) in urban wastewater across four Indian metros (Delhi, Mumbai, Kolkata, and Chennai) was conducted between March 2022 and March 2024.
• The study, by CSIR-Centre for Cellular and Molecular Biology (CCMB) and partner institutions, found that bacteria are evolving similar ways to evade antibiotics.
• Researchers analyzed 447 samples from 19 sites and used a shotgun metagenomics approach to examine bacterial genes.
• The study highlights the potential for wastewater-based pathogen surveillance to detect outbreaks and the spread of drug-resistant pathogens.

Detailed Insights:

• The study reveals that while different bacteria are abundant in different cities, they employ similar mechanisms to resist antibiotics, raising concerns for public health surveillance.
• Bacteria develop resistance through genes that strengthen cell walls, metabolize or expel antibiotic molecules, or destroy these molecules, and can share these genes with other microbes.
• Klebsiella pneumoniae is more abundant in Chennai and Mumbai, while Pseudomonas aeruginosa is more prevalent in Kolkata, but resistance genes against antibiotics like tetracyclines and beta-lactams are easily shared across all metros.
• Researchers have developed a Standard Operating Procedure for effective sample storage at 4°C for up to seven days, facilitating broader participation in wastewater-based surveillance in resource-limited settings.

Scientific/Technical Concepts Involved:

• Antimicrobial Resistance (AMR): The ability of a microorganism to resist the effects of an antimicrobial drug that was once able to treat an infection.
• Shotgun Metagenomics: A technique used to study the genetic material from environmental samples, allowing researchers to analyze the genetic diversity of microbial communities.
• Tetracyclines, Beta-Lactams, and Macrolides: Different chemical classes of antibiotics to which bacteria can develop resistance.