safety measures to protect oneself and others from COVID-19.Over 147 million people in the U.S. received at least one dose of the COVID-19 vaccines, with more than 106 million people fully vaccinated, as of May 4, 2021.Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.Even though COVID-19 vaccines are safe and effective in preventing severe disease and potentially reduce transmission of SARS-CoV-2, there are significant obstacles impeding vaccination efforts.In addition to structural barriers that limit access to vaccination, such as cost, convenience, and supply issues, there are also attitudinal barriers.Attitudinal barriers or perceptions about.