The level of community transmission is determined by the CDC from the number of COVID-19 cases there are in the population and the percent of COVID-19 tests that are positive. Learn more at CDC.gov/COVID-Data-Tracker.

When transmission is low, control is achieved largely through individual prevention behaviors and the public health response is meant to identify and isolate clusters of disease.

When transmission is moderate, adherence to individual and selected community level prevention strategies are needed to control the pandemic.

At substantial transmission, every day activities should be limited to reduce spread and protect the health care system.

At high transmission, significant measures are needed to limit contact between persons, with priority given to maintaining essential community activities and services (e.g., health care, transportation, food and agriculture, and schools)

^*County level data are not available for territories. Territory level data is available under the Cases, Deaths, and Testing tab. Data presented here for District of Columbia may lag behind by 1 day due to differences in time of uploads for state and county level data. For the most up to date data for District of Columbia, visit the Cases, Deaths, and Testing tab.