inclusion criteria: able to donate a small amount of blood, planning to receive a booster dose of an mrna-based severe acute respiratory distress syndrome coronavirus 2 vaccine, between 18-70 years of age, regularly participate in some form of exercise, including longer duration exercise sessions can safely perform 90 minutes of light to moderate intensity exercise (walk, walk/jog, or jog) based on american college of sports medicine exercise participation guidelines

inclusion criteria: able to donate a small amount of blood, planning to receive a booster dose of an mrna-based severe acute respiratory distress syndrome coronavirus 2 vaccine, between 18-70 years of age, regularly participate in some form of exercise, including longer duration exercise sessions can safely perform 90 minutes of light to moderate intensity exercise (walk, walk/jog, or jog) based on american college of sports medicine exercise participation guidelines