The optimized version of the Hecin COVID-19 Rapid Antigen Test Kit (on sale for $88/1 set) is used by government agencies, the Hospital Authority, many private hospitals and major public and private institutions [Selected by the Hospital Authority] • Variant detection: after infection Detectable in 1-7 days, can detect Omicron and Delta variant virus strains • High sensitivity: clinically proven sensitivity 97.74%, specificity 99.