Grand Rapids genetic testing companyâs partnership offers pooled COVID-19 testing for public schools Photo by iStock NxGen MDx of Grand Rapids announced a partnership with Boston-based Concentric by Ginkgo to provide COVID-19 testing to congregate settings like schools operating in-person or hybrid learning environments using a scalable and simple testing modality â pooled testing. As more schools begin to support in-person learning environments, communities across the country have turned to routine COVID-19 testing to monitor the spread of the virus. NxGen MDx, which specializes in genetic testing, said even as teachers and guardians become eligible for vaccines, clinical vaccine trials for individuals under 16 are just beginning, and efforts to track and mitigate viral spread remain critical.