- 1) Quarantine: Separation and restriction of movement (ROM) for personnel potentially exposed to a contagious disease but without symptoms of illness. These personnel may have been exposed to a disease and do not know it, or they may have the disease but do not show symptoms. This is a command function that is medically supported.
- 2) Isolation: Separation of sick personnel with a confirmed contagious disease or high index of suspicion (i.e. person under investigation) from people who are not sick. This is a medical function requiring command support.
- 3) Person Under Investigation (PUI): A patient with signs and symptoms consistent with COVID-19 infection and possible exposure to the virus. In areas where COVID-19 is already widespread, symptoms alone may make the diagnosis of “PUI.” All PUIs must be isolated.
- 4) Contact Spread: Spread of disease via direct contact with an infected patient or contaminated surface. Contact precautions aim to mitigate this method of transmission.
- 5) Droplet Spread: Spread of disease via relatively large liquid particles that settle from the air, typically within a few feet. Droplet precautions aim to mitigate this method of transmission.
- 6) Airborne Spread: Spread of disease via small liquid particles (aerosols) that remain aloft for prolonged periods of time and may travel longer distances. Airborne precautions aim to mitigate this method of transmission.