<unk> is recommended for members of the general public during severe epidemics, especially in crowded indoor areas such as stores.<unk> is a strategy for reducing disease transmission by blocking respiratory secretions produced through speaking, coughing, sneezing or singing. Surgical masks are commonly used for this purpose, with cloth face masks recommended for use by the public only in epidemic situations when there are shortages of surgical masks. In addition, respiratory etiquette such as covering the mouth and nose with a tissue when coughing can be considered<unk>  In diseases transmitted by droplets or aerosols, understanding air flow, particle and aerosol transport may lead to rational infrastructural<unk> measures that minimize exposure of susceptible persons. __TOC__
Source control 
Risk Evaluation and Mitigation Strategies
Therapeutic relationship
Cost sharing
Organ procurement
Recovery model
Theory of indispensable attributes
Guaranteed issue