SAN ANTONIO – As a way to say “thank you” to blood donors, the South Texas Blood & Tissue Center is providing free antibody testing for COVID-19 for all blood donors this summer. The free antibody tests will be available to blood donors beginning Monday, June 8, through August 31. RELATED: Who should get a COVID-19 antibody test? The antibody test isn’t meant for those that are experiencing symptoms of the virus or believe they may be infected. RELATED: What can a COVID-19 antibody test tell us?