A person is considered “exposed” to COVID-19 if they shared indoor airspace with someone who is contagious with COVID-19 for a cumulative total of 15 minutes or more within a 24-hour period.
Spaces that are separated by floor-to-ceiling walls (e.g. offices, rooms, waiting areas, bathrooms, or break or eating areas that are separated by floor-to-ceiling walls) should be considered distinct indoor spaces.
Exposed people, also called "close contacts", include people who shared indoor airspace with the infected person for a continuous 15 minutes or longer, as well as people who shared indoor airspace with the case over multiple short-duration periods that add up to at least 15 minutes during a 24-hour period. For example, if in the 2 days before the infected person had symptoms or tested positive, someone had three 5-minute interactions with the infected person within a 24-hour period, that person would be considered a close contact.
Entities such as businesses and healthcare facilities overseeing indoor spaces greater than 400,000 cubic feet per floor should consider CDPH's updated close contact definition for large indoor spaces. For more information, refer to the State Public Health Officer Order of March 3, 2022.