The External Controls - Healgen® COVID-19/Flu A&B Ag Combo Rapid Test Cassette (Swab) is a ready-to-use external control kit for use with the Healgen® COVID-19/Flu A&B Ag Combo Rapid Test Cassette (Swab). This kit is designed to verify proper test procedure and performance of the COVID-19/Flu A&B Ag Combo Rapid Test Cassette (Swab).