Many Americans are getting vaccinated but experts say even more need shots to avoid future COVID outbreaks and last updated 2021-05-24 17:58:34-04 (WXYZ) â More Americans have been getting the shot against COVID-19. At least 50% of adults are fully vaccinated in 25 states. While this is encouraging news, experts say more residents need to get vaccinated to avoid future outbreaks. Our Chief Health Editor Dr. Partha Nandi discusses where Michigan falls on this benchmark. Dr. Nandi: According to data released by the CDC, Michigan has vaccinated over 50% of adults. And we have over 57% of people age 16 and up who have been given at least one shot. Now, out of the 25 states that have reached the halfway mark, the state thatâs in first place is Maine. They have vaccinated more than 62% of adults 18 and up. While this is positive news, experts are still stressing the importance of getting those numbers higher. If we look at the total population of America, only 39% are fully vaccinated, and just over 49% have received one shot. Those numbers do jump a bit higher if we donâtâ count the kids out and only look at adults. Then we have 49.6% fully vaccinated and 61.3% whoâve been given their first shot.