LAS VEGAS, NV (December 20, 2021) GPO Plus, Inc. (OTCQB: GPOX), a publicly traded company of diversified industry-specific Group Purchasing Organizations (GPOs), today announced the official launch of AntigenTests.com, a project of HealthGPO. HealthGPO is a Group Purchasing Organization for the Healthcare industry with operations and facilities located throughout the United States. The…