When in contact with the virus, the immune system reacts by producing IgG antibodies which fight the virus.
Studies show that these antibodies are generally detected in blood after 10–14 days after the onset of the infection.
HemaXis DB10 microsampling blood collection device can be coupled to most of the ELISA kits available on the market, tests have been made on different ones, like for example the Anti-SARS-CoV-2 ELISA IgG from EUROIMMUN and are giving great performances.
These antibodies tests can be used by companies or corporation to optimally organise return to work after confinement and/or to asses the confinement plans putted in place at the start of the spread of the pandemic.
JAMA Network Viewpoint on Interpreting Diagnostic Tests for SARS-CoV-2 :