A new poll suggests the United States could be on track to vaccinate at least 70 percent of the adult population against Covid-19 by this summer. In the latest survey by the Kaiser Family Foundation, 62 percent of respondents said they had received at least one dose of a vaccine, up from 56 percent in April. At the same time, about a third of those categorized as “wait and see” reported that they had already made vaccine appointments or planned to do so imminently. Dr. William Schaffner, medical director of the National Foundation for Infectious Diseases and a vaccine expert, found the results encouraging.

“I think there are many people who were on the fence who were worried about things moving too rapidly and about possible side effects, but those concerns are being allayed as they see more of their friends and acquaintances celebrating getting vaccinated,” said Dr. Schaffner, who was not involved in the monthly survey, the Covid-19 Vaccine Monitor.

The two demographic groups reporting the greatest increase in vaccination rates from April to May were Latino adults (from 47 percent to 57 percent) and adults without college degrees (from 48 percent to 55 percent).

The telephone survey of 1,526 adults was conducted in English and Spanish from May 18 through May 25. On May 10, the Food and Drug Administration authorized the vaccine made by Pfizer and BioNTech for children ages 12 and older. The survey found that 40 percent of parents said that either their child had already gotten at least one dose or would be getting one soon.

But parents of younger children were notably more guarded, with only about a quarter expressing a willingness to get their children vaccinated as soon as the shots become authorized for them.