Quick test kit to determine a person's immunity against COVID-19 and its variants

A team of scientists from the Singapore-MIT Alliance for Research and Technology (SMART), MIT's research enterprise in Singapore, and Nanyang Technological University, Singapore (NTU Singapore) has developed a quick test kit that can tell if a person has immunity against COVID-19 and its variants, based on the antibodies detected in a blood sample.

source https://medicalxpress.com/news/2022-09-quick-kit-person-immunity-covid-.html