The role of microplastics in the spread of antimicrobial resistance in aquatic environments

Microplastics, plastic particles smaller than 5 millimeters, originate from various sources, including industrial activities and consumer products like cosmetics. These particles are categorized into primary microplastics, which are manufactured at small sizes, and secondary microplastics, which result from the breakdown of larger plastics. In aquatic environments, microplastics serve as habitats for bacterial colonization, forming biofilms that enhance microbial growth and facilitate the spread of antimicrobial resistance (AMR) genes. The presence of pollutants and antibiotics in these environments increases selective pressure on bacteria, promoting the proliferation and transfer of resistance traits. Environmental factors such as temperature, salinity, and nutrient availability further influence the stability of these biofilms and the mechanisms of gene transfer, making microplastics vectors for spreading resistant strains across aquatic systems. This ecological disruption poses significant risks to human health, primarily through the consumption of contaminated seafood and environmental exposure to resistant pathogens. Addressing this issue requires targeted mitigation strategies, including improved waste management, public awareness, and comprehensive monitoring of microplastics and AMR dynamics, to safeguard aquatic ecosystems and human health.