February 17, 2021 19:33 Updated Follow Experts do not know what percentage of people will need to get vaccinated to achieve herd immunity to COVID-19. Related articles Who should NOT get the Moderna COVID-19 vaccine (shot)? What COVID-19 vaccine is the safest and most effective? I already tested positive for COVID-19. Do I still need to get a shot? Since this vaccine was developed so quickly, how do I know there won’t be long-term side effects? Can I get the COVID-19 vaccine at the same time I get another vaccine), like my annual flu vaccine?