As more Americans are being vaccinated, more people say they are now willing to get the shots than in January. However, questions about side effects and how the shots were tested still hold some people back. This presents a challenge for U.S. health officials who are ready to expand vaccination to children as young as 12 years old. The AP-NORC survey, released Tuesday, found 1 in 5 American adults now say they probably or definitely will not get vaccinated. In January, when the shots were first given out, opinion researchers found about 1 in 3 said that they would not get vaccinated. African Americans are becoming more open to the shots, with 26 percent now saying they definitely or probably will not get vaccinated compared with 41 percent in January. That is similar to the 22 percent of Hispanic Americans. Among Asian Americans, just nine percent said they definitely or probably will not get the shots. The U.S. Centers for Disease Control and Prevention says that more than 150 million people about 58 percent of all adults have received at least one dose of a vaccine. Among those who remain unvaccinated, only 34 percent of people in the study say they definitely will not get the shot. About three-fourths of those who said they are unlikely to get vaccinated have little to no confidence that the vaccines were tested enough. Some 55 percent were very concerned about side effects. The numbers, however, mean a large number of unvaccinated Americans could be persuaded to get the shots. Kizzmekia Corbett is an immunologist with the National Institutes of Health. Corbett helped lead development of the Moderna shot. She spends hours giving answers to questions from Americans especially African Americans like her. Her job is to fight against misinformation about the three vaccines approved for emergency use in the U.S. She tells people the COVID-19 vaccines will not cause inability to bear children. Also, the speedy development of vaccines does not mean they are less safe, Corbett told the AP.