Why would the classroom doorknob be the least infected areas?

The classroom doorknob may be the least infected area because it is often made of materials that resist microbial growth, such as metal, which has antimicrobial properties. Additionally, doorknobs are frequently cleaned and disinfected during routine maintenance. Furthermore, they are typically touched by many people in a short period, which may lead to rapid transfer and dispersal of pathogens rather than prolonged contact with a single surface. Lastly, the airflow in classrooms can help reduce the survival of airborne pathogens around frequently touched surfaces.