With increasing distance from the source, the role of inhalation likewise increases. Transmission of SARS-CoV-2 from inhalation of virus in the air farther than six feet from an infectious source can occur Progressive loss of viral viability and infectiousness over time influenced by environmental factors such as temperature, humidity, and ultraviolet radiation (e.g., sunlight).This mixing is not necessarily uniform and can be influenced by thermal layering and initial jetting of exhalations. Decreasing concentration of virus in the air as larger and heavier respiratory droplets containing virus fall to the ground or other surfaces under the force of gravity and the very fine droplets and aerosol particles that remain in the airstream progressively mix with, and become diluted within, the growing volume and streams of air they encounter. Two principal processes determine the amount of virus to which a person is exposed in the air or by touching a surface contaminated by virus: The risk for infection decreases with increasing distance from the source and increasing time after exhalation. Once infectious droplets and particles are exhaled, they move outward from the source. The risk of SARS-CoV-2 infection varies according to the amount of virus to which a person is exposed
0 Comments
Leave a Reply. |