Microplastics and Virus Adsorption in Aquatic Environments
Microplastics act as vectors by facilitating virus adhesion through biofilm formation. 1, 2
Rationale (highest-priority evidence):
- Guideline-level synthesis emphasizes rapid eco-corona and biofilm formation on weathered microplastics, altering surface charge/roughness and enhancing sorption of environmental constituents, including microbes—thereby enabling adhesion and potential transport of pathogens on plastics (“plastisphere”) 1.
- Water-quality guideline review flags biofilms on microplastics as reservoirs of microbial pathogens, supporting vector potential in aquatic systems 2.
Augmenting research details:
- Hospital sewage study detected multiple human viral genomes (e.g., adenovirus, norovirus) on biofilm-colonized microplastic fibers, with some viruses present on particles but absent from treated water, supporting carrier/vector behavior 3.
- Laboratory and review data show virus–microplastic heteroaggregation driven by electrostatic/hydrophobic interactions and eco-coronas, influencing persistence and mobility; some studies note reduced infective phage counts from adsorption or leachables, yet co-transport is enhanced, indicating vector potential despite partial inactivation 4, 5, 6.
Pitfalls/caveats to avoid:
- Do not assume microplastics “repel” viruses; weathering and biofilms flip surfaces from hydrophobic-inert to adsorption-prone 1.
- Microplastics do not “dissolve” viruses nor directly “enhance replication”; observed effects are adsorption, carriage, and transport, with mixed impacts on infectivity depending on polymer, charge, biofilm state, and environmental conditions 4, 7, 5.