A teenager who recently tested positive for Covid-19 worked two shifts at the Botany Kmart last week despite advice from their school for all households to stay home until they got a negative test.
They were at Kmart on Friday the 19 February and Saturday the 20 February between 4 in the afternoon and 10 at night.
Anyone at the store at these times is considered a casual plus contact, and is being asked to immediately isolate at home and get a test.
All 31 K-mart Botany staff have been identified as close contacts and are isolating.
Amy Williams is at Kmart in Botany.