Early data show that the vaccines may help keep people from spreading COVID-19, but we are learning more as more people get vaccinated, according to the CDC. You must get both doses to be fully vaccinated against COVID-19. More studies are needed to understand how new variants may affect the effectiveness of existing COVID-19 vaccines. Many times, people who do get sick after getting a vaccine have a milder case. Continue to frequently wash your hands and use hand sanitizer with at least 60% alcohol after getting vaccinated.