This kind of a study across dozens of different communities would have taken years to complete if not for the cooperation of a major sports league, researchers told me.
MLB declined to tell me which three teams opted out of this study, or why.
Why MLB employees? Testing 10,000 people in dozens of cities across the country during a lockdown that includes people of all ages, races, genders, wealth, etc requires a lot of structured help. All teams send out and collect tests from their people, and provide health counseling
Some players and employees have told me they opted out of the test because they are squeamish with needles. (It involves a pinprick blood test of the middle of index finger). Others have embraced the test/want to help the study/want to know if they had the virus.
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