Respiratory Droplet

**Semantic type:** Body Substance

**Definition:** A respiratory fluid particle that is propelled from the mouth or nose during talking, coughing, sneezing, or other forms of exhalation which include various cells types (e.g. epithelial cells and cells of the immune system), physiological electrolytes contained in mucous and saliva (e.g. Na+, K+, Cl-), as well as, potentially, various infectious agents (e.g. bacteria, fungi and viruses).