As of the May 18-23 survey, 60% of U.S. adults report they have been fully vaccinated against COVID-19, 4% have been partially vaccinated, 12% plan to be vaccinated and 24% do not plan to be vaccinated. Among those not planning to be vaccinated, 78% say they are unlikely to reconsider their plans, including 51% who say they are "not likely at all" to change their mind and get vaccinated. That leaves one in five vaccine-reluctant adults open to reconsidering, with 2% saying they are very likely and 19% saying they are somewhat likely to change their mind and get vaccinated -- equivalent to 5% of all U.S. adults.