Microbial diversity and environmental determinants at Shanghai Hongqiao railway station: A comprehensive microbial assessment

The COVID-19 pandemic has underscored the importance of indoor environmental management in transportation hubs, which are critical for pathogen transmission due to high foot traffic. However, research has primarily focused on subways, with limited studies on train stations. In this study, samples were collected at the Shanghai Hongqiao Railway Station in winter, spring, and summer. Microbial DNA was extracted from collected indoor surfaces and ambient air samples and then analyzed through high-throughput 16S rRNA gene sequencing. Alongside sample collection, environmental data were recorded. Alpha diversity was greatest in winter, followed by summer, and least in spring within the train station environment. Surface samples exhibited higher alpha diversity compared to air samples, with no notable difference between indoor and outdoor air. Beta diversity showed significant variation across seasons and locations, with seasonal changes more pronounced than spatial ones, primarily due to differences between air and surface samples rather than indoor and outdoor environments. Key determinants of microbial community structure included CO₂, temperature, illuminance, and passenger volume. The microbial community in train stations originates from various sources, with contributions from both natural elements (like wastewater/sludge, soil, and plants) and human sources (such as gastrointestinal, oral, and dermal flora). This study highlights the microbial ecology of train stations, emphasizing the need for microbial surveillance and management in transportation settings.