MLB's COVID-19 Positivity Rate Keeps Opening Day On Track MLB continues to have success keeping COVID-19 at bay ahead of Opening Day. Author: Mar 12, 2021 On Friday, Major League Baseball (MLB) and the Players Association (MLBPA) jointly announced the latest COVID-19 testing results conducted under MLB’s COVID-19 Health Monitoring & Testing Plan. According to a press release, the independent Utah laboratory has reported 14,704 tests were conducted during the past week, with two new positive tests (both players); a 0.01% positive rate. Since MLB began its monitoring testing, 43,928 tests have been conducted, with 12 total positive tests (nine players, three staff members) on nine different clubs; a 0.03% positive rate.