This is unknown. Experts hope that when at least 70 percent of the population is vaccinated, “herd immunity” will occur. Herd immunity, also known as “population immunity,” occurs when a large portion of the population becomes immune to the disease, making the spread of the virus from person to person unlikely. Government healthcare leaders expect to have enough vaccine doses to vaccinate 70 percent of the U.S. population by May 2021. Therefore, it is possible that we may return to some semblance of pre-COVID life during the summer of 2021.