This dream is a reflection of your fears and anxieties about the spread of illness and disease. The book represents knowledge and information, and the dust virus symbolizes a hidden danger or threat that can easily be transmitted. The person who picks up the book and breathes in the virus represents someone who is exposed to this danger, possibly through their own curiosity or lack of caution. The closed room represents a confined space, where the virus can easily spread from person to person. This could represent a workplace or social setting where people are in close proximity to each other. The fact that the virus is spread through coughing suggests that it is an airborne illness, which can be easily transmitted through respiratory droplets. This dream may be a warning to be cautious and aware of potential health risks in your surroundings. It could also symbolize the spread of negative or harmful ideas or behaviors that can have a contagious effect on others. It is important to be mindful of what you expose yourself to and to take precautions to protect yourself and others from potential harm.