Imported - Infection resulting from exposure outside the country during the incubation period (7-18 days prior to rash onset for measles and 14-23 days for rubella) as supported by epidemiological and/or virological evidence.

Imported-related - Locally-acquired infection due to transmission from an imported or other import-related case as supported by epidemiologic and/or virological evidence.

Endemic - Locally acquired infection due to transmission of an indigenous virus or an imported measles virus that has persisted in the country for ≥12 months.