Frequent PCR testing will be administered by the Sports Medicine Research and Testing Laboratory on saliva samples collected via the Spectrum Solutions SDNA-100 saliva collection kits. Players and other on-field personnel will continue be tested at least every other day throughout Spring Training, the 2021 Championship Season, and (as applicable) the postseason. Daily symptom screens and temperature checks will be recorded at least twice daily. As a supplement to routine Monitoring Testing, accurate and reliable point-of-care testing will also be available to all Clubs at home and on the road.
https://www.mlb.com/news/health-and-safety-protocols-for-2021-mlb-season