Most trades are made in good faith with the information each manager has on hand at any given moment. The vaccine mitigates the impact of the virus but, doesn't eliminate that possibility of contracting it. I speak from experience. I can also tell you that everyone experiences the symptoms differently in severity and longevity. A player who tests positive could be asymptomatic and activated quickly or could be lost for weeks at a time. I for one would like to see the rosters kept at 41 for another year and then revisited next year as the end of the season but, prior to open trading.