* already received a covid19 booster * are not planning on receiving a covid19 booster in the next 3 months * do not have equal access to both the pfizer and moderna boosters * have a medical reason to receive either the pfizer or moderna booster * have a medical reason to not receive any booster (e.g h/o allergic reaction to an mrna vaccine or myocarditis or pericarditis after an mrna vaccine) * are unwilling to be randomized * are unable to commit to filling out the ccs weekly surveys consistently (to the best of their ability)

* already received a covid19 booster * are not planning on receiving a covid19 booster in the next 3 months * do not have equal access to both the pfizer and moderna boosters * have a medical reason to receive either the pfizer or moderna booster * have a medical reason to not receive any booster (e.g h/o allergic reaction to an mrna vaccine or myocarditis or pericarditis after an mrna vaccine) * are unwilling to be randomized * are unable to commit to filling out the ccs weekly surveys consistently (to the best of their ability)

already received a covid19 booster are not planning on receiving a covid19 booster in the next 3 months do not have equal access to both the pfizer and moderna boosters have a medical reason to receive either the pfizer or moderna booster have a medical reason to not receive any booster (e.g h/o allergic reaction to an mrna vaccine or myocarditis or pericarditis after an mrna vaccine) are unwilling to be randomized are unable to commit to filling out the ccs weekly surveys consistently (to the best of their ability)

already received a covid19 booster are not planning on receiving a covid19 booster in the next 3 months do not have equal access to both the pfizer and moderna boosters have a medical reason to receive either the pfizer or moderna booster have a medical reason to not receive any booster (e.g h/o allergic reaction to an mrna vaccine or myocarditis or pericarditis after an mrna vaccine) are unwilling to be randomized are unable to commit to filling out the ccs weekly surveys consistently (to the best of their ability)