Association of Aerodynamic Size of Bioaerosols with Biodiversity and Antibiotic-resistance in kindergartens

The study responds to the importance of investigating the aerodynamic size of bioaerosols, identifying the effects of particles of hazardous sizes on health in different urbanization indoor environments. Skin flakes with airborne antibiotic-resistant bacteria are abundant in the indoor environment of a kindergarten, and whether they are deposited to, or resuspended from surfaces, they are abundant in the air. Air transmission and inhalation of respirable bioaerosols have become very important issues nowadays, children in kindergartens may experience greater long-term health effects of exposure to bioaerosol than adults. The urbanized kindergarten tends to have smaller bacteria particle size and size distribution, moreover, it also tends to have lower biodiversities than suburban and rural kindergartens (p < 0.05), probably due to the recirculated air conditioning, lower air change rate per hour, higher relative humidity, and CO2 concentration, and consequently has higher occupant (children and nursery staff) emission rate, airborne concentration, human-associated bacteria, and the putative Staphylococcus aureus count.