Plastic pollution extends beyond being a mere environmental nuisance. Recent findings published in the journal Biocontaminant suggest that viruses residing on plastic surfaces may contribute to the spread of antibiotic resistance, presenting a serious threat to global environmental and public health.
Once plastics enter natural habitats, they are quickly colonised by microbial biofilms, known as the plastisphere. These biofilms are recognised as hotspots for antibiotic resistance genes. The study emphasises the role of viruses — Earth’s most abundant biological entities — in potentially transferring resistance genes between microbes within these communities.
“Most research has focused on bacteria in the plastisphere, but viruses are everywhere in these communities and interact closely with their hosts,” stated Dong Zhu from the Chinese Academy of Sciences. Zhu’s work indicates that plastisphere viruses could act as hidden drivers of antibiotic resistance dissemination.
Viruses facilitate genetic material transfer between bacteria through horizontal gene transfer. In the densely populated plastisphere biofilms, viruses might more effectively shuttle resistance genes across species, including potential pathogens. Additionally, some viruses harbour auxiliary metabolic genes that enhance bacterial survival under stressful conditions like antibiotic exposure, indirectly favouring resistant strains.
The study notes that viral behaviour varies by environment. In aquatic plastispheres, viruses may adopt strategies that enhance gene transfer, increasing resistance risks. Conversely, in soil environments, viruses might limit resistant bacteria by destroying their hosts. These varying roles underscore the necessity of considering environmental context in assessing plastic pollution risks.
“This perspective emphasises that antibiotic resistance linked to plastics cannot be fully understood without including viral ecology,” said lead author Xue Peng Chen. He advocates for integrating viruses into a One Health framework to better evaluate the long-term impact of plastic pollution.
The authors call for further research to directly measure gene exchange between viruses and bacteria on plastics and to refine detection methods for virus-encoded resistance genes. These insights could inform environmental monitoring and plastic waste management strategies aimed at mitigating antibiotic resistance risks.
