The survey found big increases over last month in Latinos getting the shot and in unvaccinated people who say they have made an appointment. … A new poll suggests the US 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.