Covid vaccine trials did NOT monitor whether participants took other steps to prevent infection like wearing masks and social distancing

A participant in Pfizer's coronavirus vaccine trials told Business Insider that the firm did not monitor the participants behavior if they didn't feel sick. Moderna also did not specify how to behave or track data on the participants' actions during its trial It was left up to individuals to wear masks or socially distance - behaviors that are estimated to reduce the risk of spreading or catching COVID-19.